diff --git a/chat_box/migrations/0013_alter_message_time.py b/chat_box/migrations/0013_alter_message_time.py
new file mode 100644
index 0000000..0f4ddc3
--- /dev/null
+++ b/chat_box/migrations/0013_alter_message_time.py
@@ -0,0 +1,20 @@
+# Generated by Django 3.2.18 on 2023-08-28 01:24
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("chat_box", "0012_auto_20230308_1417"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="message",
+            name="time",
+            field=models.DateTimeField(
+                auto_now_add=True, db_index=True, verbose_name="posted time"
+            ),
+        ),
+    ]
diff --git a/chat_box/migrations/0014_userroom_unread_count.py b/chat_box/migrations/0014_userroom_unread_count.py
new file mode 100644
index 0000000..8f407b3
--- /dev/null
+++ b/chat_box/migrations/0014_userroom_unread_count.py
@@ -0,0 +1,38 @@
+# Generated by Django 3.2.18 on 2023-08-28 06:02
+
+from django.db import migrations, models
+
+
+def migrate(apps, schema_editor):
+    UserRoom = apps.get_model("chat_box", "UserRoom")
+    Message = apps.get_model("chat_box", "Message")
+
+    for ur in UserRoom.objects.all():
+        if not ur.room:
+            continue
+        messages = ur.room.message_set
+        last_msg = messages.first()
+        try:
+            if last_msg and last_msg.author != ur.user:
+                ur.unread_count = messages.filter(time__gte=ur.last_seen).count()
+            else:
+                ur.unread_count = 0
+            ur.save()
+        except:
+            continue
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("chat_box", "0013_alter_message_time"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="userroom",
+            name="unread_count",
+            field=models.IntegerField(db_index=True, default=0),
+        ),
+        migrations.RunPython(migrate, migrations.RunPython.noop, atomic=True),
+    ]
diff --git a/chat_box/models.py b/chat_box/models.py
index 61e39a6..b6d7220 100644
--- a/chat_box/models.py
+++ b/chat_box/models.py
@@ -1,9 +1,10 @@
 from django.db import models
-from django.db.models import CASCADE
+from django.db.models import CASCADE, Q
 from django.utils.translation import gettext_lazy as _
 
 
 from judge.models.profile import Profile
+from judge.caching import cache_wrapper
 
 
 __all__ = ["Message", "Room", "UserRoom", "Ignore"]
@@ -29,7 +30,9 @@ class Room(models.Model):
 
 class Message(models.Model):
     author = models.ForeignKey(Profile, verbose_name=_("user"), on_delete=CASCADE)
-    time = models.DateTimeField(verbose_name=_("posted time"), auto_now_add=True)
+    time = models.DateTimeField(
+        verbose_name=_("posted time"), auto_now_add=True, db_index=True
+    )
     body = models.TextField(verbose_name=_("body of comment"), max_length=8192)
     hidden = models.BooleanField(verbose_name="is hidden", default=False)
     room = models.ForeignKey(
@@ -56,6 +59,7 @@ class UserRoom(models.Model):
         Room, verbose_name="room id", on_delete=CASCADE, default=None, null=True
     )
     last_seen = models.DateTimeField(verbose_name=_("last seen"), auto_now_add=True)
+    unread_count = models.IntegerField(default=0, db_index=True)
 
     class Meta:
         unique_together = ("user", "room")
@@ -74,11 +78,9 @@ class Ignore(models.Model):
     @classmethod
     def is_ignored(self, current_user, new_friend):
         try:
-            return (
-                current_user.ignored_chat_users.get()
-                .ignored_users.filter(id=new_friend.id)
-                .exists()
-            )
+            return current_user.ignored_chat_users.ignored_users.filter(
+                id=new_friend.id
+            ).exists()
         except:
             return False
 
@@ -89,6 +91,16 @@ class Ignore(models.Model):
         except:
             return Profile.objects.none()
 
+    @classmethod
+    def get_ignored_rooms(self, user):
+        try:
+            ignored_users = self.objects.get(user=user).ignored_users.all()
+            return Room.objects.filter(Q(user_one=user) | Q(user_two=user)).filter(
+                Q(user_one__in=ignored_users) | Q(user_two__in=ignored_users)
+            )
+        except:
+            return Room.objects.none()
+
     @classmethod
     def add_ignore(self, current_user, friend):
         ignore, created = self.objects.get_or_create(user=current_user)
diff --git a/chat_box/utils.py b/chat_box/utils.py
index e25e861..dd59d98 100644
--- a/chat_box/utils.py
+++ b/chat_box/utils.py
@@ -1,10 +1,12 @@
 from cryptography.fernet import Fernet
+import hmac
+import hashlib
 
 from django.conf import settings
-from django.db.models import OuterRef, Count, Subquery, IntegerField
+from django.db.models import OuterRef, Count, Subquery, IntegerField, Q
 from django.db.models.functions import Coalesce
 
-from chat_box.models import Ignore, Message, UserRoom
+from chat_box.models import Ignore, Message, UserRoom, Room
 
 secret_key = settings.CHAT_SECRET_KEY
 fernet = Fernet(secret_key)
@@ -24,25 +26,22 @@ def decrypt_url(message_encrypted):
         return None, None
 
 
-def get_unread_boxes(profile):
-    ignored_users = Ignore.get_ignored_users(profile)
-
-    mess = (
-        Message.objects.filter(room=OuterRef("room"), time__gte=OuterRef("last_seen"))
-        .exclude(author=profile)
-        .exclude(author__in=ignored_users)
-        .order_by()
-        .values("room")
-        .annotate(unread_count=Count("pk"))
-        .values("unread_count")
+def encrypt_channel(channel):
+    return (
+        hmac.new(
+            settings.CHAT_SECRET_KEY.encode(),
+            channel.encode(),
+            hashlib.sha512,
+        ).hexdigest()[:16]
+        + "%s" % channel
     )
 
+
+def get_unread_boxes(profile):
+    ignored_rooms = Ignore.get_ignored_rooms(profile)
     unread_boxes = (
-        UserRoom.objects.filter(user=profile, room__isnull=False)
-        .annotate(
-            unread_count=Coalesce(Subquery(mess, output_field=IntegerField()), 0),
-        )
-        .filter(unread_count__gte=1)
+        UserRoom.objects.filter(user=profile, unread_count__gt=0)
+        .exclude(room__in=ignored_rooms)
         .count()
     )
 
diff --git a/chat_box/views.py b/chat_box/views.py
index cea58e1..879dfcf 100644
--- a/chat_box/views.py
+++ b/chat_box/views.py
@@ -21,6 +21,7 @@ from django.db.models import (
     Exists,
     Count,
     IntegerField,
+    F,
 )
 from django.db.models.functions import Coalesce
 from django.utils import timezone
@@ -34,7 +35,7 @@ from judge.jinja2.gravatar import gravatar
 from judge.models import Friend
 
 from chat_box.models import Message, Profile, Room, UserRoom, Ignore
-from chat_box.utils import encrypt_url, decrypt_url
+from chat_box.utils import encrypt_url, decrypt_url, encrypt_channel
 
 import json
 
@@ -49,7 +50,8 @@ class ChatView(ListView):
         self.room_id = None
         self.room = None
         self.messages = None
-        self.page_size = 20
+        self.first_page_size = 20  # only for first request
+        self.follow_up_page_size = 50
 
     def get_queryset(self):
         return self.messages
@@ -63,10 +65,12 @@ class ChatView(ListView):
 
     def get(self, request, *args, **kwargs):
         request_room = kwargs["room_id"]
+        page_size = self.follow_up_page_size
         try:
             last_id = int(request.GET.get("last_id"))
         except Exception:
             last_id = 1e15
+            page_size = self.first_page_size
         only_messages = request.GET.get("only_messages")
 
         if request_room:
@@ -80,11 +84,12 @@ class ChatView(ListView):
             request_room = None
 
         self.room_id = request_room
-        self.messages = Message.objects.filter(
-            hidden=False, room=self.room_id, id__lt=last_id
-        )[: self.page_size]
+        self.messages = (
+            Message.objects.filter(hidden=False, room=self.room_id, id__lt=last_id)
+            .select_related("author", "author__user")
+            .defer("author__about", "author__user_script")[:page_size]
+        )
         if not only_messages:
-            update_last_seen(request, **kwargs)
             return super().get(request, *args, **kwargs)
 
         return render(
@@ -101,10 +106,14 @@ class ChatView(ListView):
 
         context["title"] = self.title
         context["last_msg"] = event.last()
-        context["status_sections"] = get_status_context(self.request)
+        context["status_sections"] = get_status_context(self.request.profile)
         context["room"] = self.room_id
         context["has_next"] = self.has_next()
         context["unread_count_lobby"] = get_unread_count(None, self.request.profile)
+        context["chat_channel"] = encrypt_channel(
+            "chat_" + str(self.request.profile.id)
+        )
+        context["chat_lobby_channel"] = encrypt_channel("chat_lobby")
         if self.room:
             users_room = [self.room.user_one, self.room.user_two]
             users_room.remove(self.request.profile)
@@ -187,7 +196,7 @@ def post_message(request):
 
     if not room:
         event.post(
-            "chat_lobby",
+            encrypt_channel("chat_lobby"),
             {
                 "type": "lobby",
                 "author_id": request.profile.id,
@@ -199,7 +208,7 @@ def post_message(request):
     else:
         for user in room.users():
             event.post(
-                "chat_" + str(user.id),
+                encrypt_channel("chat_" + str(user.id)),
                 {
                     "type": "private",
                     "author_id": request.profile.id,
@@ -208,6 +217,10 @@ def post_message(request):
                     "tmp_id": request.POST.get("tmp_id"),
                 },
             )
+            if user != request.profile:
+                UserRoom.objects.filter(user=user, room=room).update(
+                    unread_count=F("unread_count") + 1
+                )
 
     return JsonResponse(ret)
 
@@ -254,35 +267,33 @@ def update_last_seen(request, **kwargs):
         room_id = request.POST.get("room")
     else:
         return HttpResponseBadRequest()
-
     try:
         profile = request.profile
         room = None
         if room_id:
-            room = Room.objects.get(id=int(room_id))
+            room = Room.objects.filter(id=int(room_id)).first()
     except Room.DoesNotExist:
         return HttpResponseBadRequest()
-    except Exception as e:
-        return HttpResponseBadRequest()
 
     if room and not room.contain(profile):
         return HttpResponseBadRequest()
 
     user_room, _ = UserRoom.objects.get_or_create(user=profile, room=room)
     user_room.last_seen = timezone.now()
+    user_room.unread_count = 0
     user_room.save()
 
     return JsonResponse({"msg": "updated"})
 
 
 def get_online_count():
-    last_two_minutes = timezone.now() - timezone.timedelta(minutes=2)
-    return Profile.objects.filter(last_access__gte=last_two_minutes).count()
+    last_5_minutes = timezone.now() - timezone.timedelta(minutes=5)
+    return Profile.objects.filter(last_access__gte=last_5_minutes).count()
 
 
 def get_user_online_status(user):
     time_diff = timezone.now() - user.last_access
-    is_online = time_diff <= timezone.timedelta(minutes=2)
+    is_online = time_diff <= timezone.timedelta(minutes=5)
     return is_online
 
 
@@ -319,47 +330,51 @@ def user_online_status_ajax(request):
         )
 
 
-def get_online_status(request_user, queryset, rooms=None):
-    if not queryset:
+def get_online_status(profile, other_profile_ids, rooms=None):
+    if not other_profile_ids:
         return None
-    last_two_minutes = timezone.now() - timezone.timedelta(minutes=2)
+    joined_ids = ",".join([str(id) for id in other_profile_ids])
+    other_profiles = Profile.objects.raw(
+        f"SELECT * from judge_profile where id in ({joined_ids}) order by field(id,{joined_ids})"
+    )
+    last_5_minutes = timezone.now() - timezone.timedelta(minutes=5)
     ret = []
-
     if rooms:
-        unread_count = get_unread_count(rooms, request_user)
+        unread_count = get_unread_count(rooms, profile)
         count = {}
         for i in unread_count:
             count[i["other_user"]] = i["unread_count"]
-
-    for user in queryset:
+    for other_profile in other_profiles:
         is_online = False
-        if user.last_access >= last_two_minutes:
+        if other_profile.last_access >= last_5_minutes:
             is_online = True
-        user_dict = {"user": user, "is_online": is_online}
-        if rooms and user.id in count:
-            user_dict["unread_count"] = count[user.id]
-        user_dict["url"] = encrypt_url(request_user.id, user.id)
+        user_dict = {"user": other_profile, "is_online": is_online}
+        if rooms and other_profile.id in count:
+            user_dict["unread_count"] = count[other_profile.id]
+        user_dict["url"] = encrypt_url(profile.id, other_profile.id)
         ret.append(user_dict)
     return ret
 
 
-def get_status_context(request, include_ignored=False):
+def get_status_context(profile, include_ignored=False):
     if include_ignored:
-        ignored_users = Profile.objects.none()
+        ignored_users = []
         queryset = Profile.objects
     else:
-        ignored_users = Ignore.get_ignored_users(request.profile)
+        ignored_users = list(
+            Ignore.get_ignored_users(profile).values_list("id", flat=True)
+        )
         queryset = Profile.objects.exclude(id__in=ignored_users)
 
-    last_two_minutes = timezone.now() - timezone.timedelta(minutes=2)
+    last_5_minutes = timezone.now() - timezone.timedelta(minutes=5)
     recent_profile = (
-        Room.objects.filter(Q(user_one=request.profile) | Q(user_two=request.profile))
+        Room.objects.filter(Q(user_one=profile) | Q(user_two=profile))
         .annotate(
             last_msg_time=Subquery(
                 Message.objects.filter(room=OuterRef("pk")).values("time")[:1]
             ),
             other_user=Case(
-                When(user_one=request.profile, then="user_two"),
+                When(user_one=profile, then="user_two"),
                 default="user_one",
             ),
         )
@@ -369,50 +384,49 @@ def get_status_context(request, include_ignored=False):
         .values("other_user", "id")[:20]
     )
 
-    recent_profile_id = [str(i["other_user"]) for i in recent_profile]
-    joined_id = ",".join(recent_profile_id)
+    recent_profile_ids = [str(i["other_user"]) for i in recent_profile]
     recent_rooms = [int(i["id"]) for i in recent_profile]
-    recent_list = None
-    if joined_id:
-        recent_list = Profile.objects.raw(
-            f"SELECT * from judge_profile where id in ({joined_id}) order by field(id,{joined_id})"
-        )
     friend_list = (
-        Friend.get_friend_profiles(request.profile)
-        .exclude(id__in=recent_profile_id)
+        Friend.get_friend_profiles(profile)
+        .exclude(id__in=recent_profile_ids)
         .exclude(id__in=ignored_users)
         .order_by("-last_access")
+        .values_list("id", flat=True)
     )
+
     admin_list = (
         queryset.filter(display_rank="admin")
         .exclude(id__in=friend_list)
-        .exclude(id__in=recent_profile_id)
+        .exclude(id__in=recent_profile_ids)
+        .values_list("id", flat=True)
     )
+
     all_user_status = (
-        queryset.filter(display_rank="user", last_access__gte=last_two_minutes)
+        queryset.filter(last_access__gte=last_5_minutes)
         .annotate(is_online=Case(default=True, output_field=BooleanField()))
         .order_by("-rating")
         .exclude(id__in=friend_list)
         .exclude(id__in=admin_list)
-        .exclude(id__in=recent_profile_id)[:30]
+        .exclude(id__in=recent_profile_ids)
+        .values_list("id", flat=True)[:30]
     )
 
     return [
         {
             "title": "Recent",
-            "user_list": get_online_status(request.profile, recent_list, recent_rooms),
+            "user_list": get_online_status(profile, recent_profile_ids, recent_rooms),
         },
         {
             "title": "Following",
-            "user_list": get_online_status(request.profile, friend_list),
+            "user_list": get_online_status(profile, friend_list),
         },
         {
             "title": "Admin",
-            "user_list": get_online_status(request.profile, admin_list),
+            "user_list": get_online_status(profile, admin_list),
         },
         {
             "title": "Other",
-            "user_list": get_online_status(request.profile, all_user_status),
+            "user_list": get_online_status(profile, all_user_status),
         },
     ]
 
@@ -423,7 +437,7 @@ def online_status_ajax(request):
         request,
         "chat/online_status.html",
         {
-            "status_sections": get_status_context(request),
+            "status_sections": get_status_context(request.profile),
             "unread_count_lobby": get_unread_count(None, request.profile),
         },
     )
@@ -447,7 +461,6 @@ def get_or_create_room(request):
         return HttpResponseBadRequest()
 
     request_id, other_id = decrypt_url(decrypted_other_id)
-
     if not other_id or not request_id or request_id != request.profile.id:
         return HttpResponseBadRequest()
 
@@ -475,48 +488,31 @@ def get_or_create_room(request):
 
 def get_unread_count(rooms, user):
     if rooms:
-        mess = (
-            Message.objects.filter(
-                room=OuterRef("room"), time__gte=OuterRef("last_seen")
-            )
-            .exclude(author=user)
-            .order_by()
-            .values("room")
-            .annotate(unread_count=Count("pk"))
-            .values("unread_count")
-        )
-
-        return (
-            UserRoom.objects.filter(user=user, room__in=rooms)
-            .annotate(
-                unread_count=Coalesce(Subquery(mess, output_field=IntegerField()), 0),
-                other_user=Case(
-                    When(room__user_one=user, then="room__user_two"),
-                    default="room__user_one",
-                ),
-            )
-            .filter(unread_count__gte=1)
-            .values("other_user", "unread_count")
-        )
-    else:  # lobby
-        mess = (
-            Message.objects.filter(room__isnull=True, time__gte=OuterRef("last_seen"))
-            .exclude(author=user)
-            .order_by()
-            .values("room")
-            .annotate(unread_count=Count("pk"))
-            .values("unread_count")
-        )
-
         res = (
-            UserRoom.objects.filter(user=user, room__isnull=True)
-            .annotate(
-                unread_count=Coalesce(Subquery(mess, output_field=IntegerField()), 0),
+            UserRoom.objects.filter(user=user, room__in=rooms, unread_count__gt=0)
+            .select_related("room__user_one", "room__user_two")
+            .values("unread_count", "room__user_one", "room__user_two")
+        )
+        for ur in res:
+            ur["other_user"] = (
+                ur["room__user_one"]
+                if ur["room__user_two"] == user.id
+                else ur["room__user_two"]
             )
-            .values_list("unread_count", flat=True)
+        return res
+    else:  # lobby
+        user_room = UserRoom.objects.filter(user=user, room__isnull=True).first()
+        if not user_room:
+            return 0
+        last_seen = user_room.last_seen
+        res = (
+            Message.objects.filter(room__isnull=True, time__gte=last_seen)
+            .exclude(author=user)
+            .exclude(hidden=True)
+            .count()
         )
 
-        return res[0] if len(res) else 0
+        return res
 
 
 @login_required
diff --git a/dmoj/settings.py b/dmoj/settings.py
index e205e60..d03dc27 100644
--- a/dmoj/settings.py
+++ b/dmoj/settings.py
@@ -484,3 +484,6 @@ except IOError:
     pass
 
 DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
+
+# Chat
+CHAT_SECRET_KEY = "QUdVFsxk6f5-Hd8g9BXv81xMqvIZFRqMl-KbRzztW-U="
diff --git a/judge/migrations/0166_display_rank_index.py b/judge/migrations/0166_display_rank_index.py
new file mode 100644
index 0000000..ffea311
--- /dev/null
+++ b/judge/migrations/0166_display_rank_index.py
@@ -0,0 +1,28 @@
+# Generated by Django 3.2.18 on 2023-08-28 01:13
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("judge", "0165_drop_output_prefix_override"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="profile",
+            name="display_rank",
+            field=models.CharField(
+                choices=[
+                    ("user", "Normal User"),
+                    ("setter", "Problem Setter"),
+                    ("admin", "Admin"),
+                ],
+                db_index=True,
+                default="user",
+                max_length=10,
+                verbose_name="display rank",
+            ),
+        ),
+    ]
diff --git a/judge/models/profile.py b/judge/models/profile.py
index ccb0e87..3f6e430 100644
--- a/judge/models/profile.py
+++ b/judge/models/profile.py
@@ -183,6 +183,7 @@ class Profile(models.Model):
             ("setter", "Problem Setter"),
             ("admin", "Admin"),
         ),
+        db_index=True,
     )
     mute = models.BooleanField(
         verbose_name=_("comment mute"),
diff --git a/templates/chat/chat.html b/templates/chat/chat.html
index 9cde791..857aaf9 100644
--- a/templates/chat/chat.html
+++ b/templates/chat/chat.html
@@ -7,21 +7,11 @@
 
   <script type="text/javascript" src="{{ static('mathjax3_config.js') }}"></script>
   <script type="text/javascript" src="{{ static('event.js') }}"></script>
-  <script src="https://unpkg.com/@popperjs/core@2"></script>
   <script type="module" src="https://unpkg.com/emoji-picker-element@1"></script>
-  <script type="text/javascript">
-    let message_template = `
-{% with message=message_template %}
-    {% include "chat/message.html" %}
-{% endwith %}  
-    `;
-    let META_HEADER = [
-      "{{_('Recent')}}",
-      "{{_('Following')}}",
-      "{{_('Admin')}}",
-      "{{_('Other')}}",
-    ];
-  </script>
+  {% compress js %}
+    {% include "chat/chat_js.html" %}
+  {% endcompress %}
+
   <script type="text/javascript">
     window.limit_time = 24;
     window.room_id = "{{room if room else ''}}";
@@ -32,73 +22,10 @@
     window.pushed_messages = new Set();
     let isMobile = window.matchMedia("only screen and (max-width: 799px)").matches;
 
-    function load_next_page(last_id, refresh_html=false) {
-      var param = {
-        'last_id': last_id,
-        'only_messages': true,
-      }
-      $.get("{{ url('chat', '') }}" + window.room_id, param)
-        .fail(function() {
-        console.log("Fail to load page, last_id = " + last_id);
-      })
-        .done(function(data) {
-        if (refresh_html) {
-          $('#chat-log').html('');
-          $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
-          window.lock = true;
-        }
-        var time = refresh_html ? 0 : 200;
-
-        setTimeout(function() {
-          $(".has_next").remove();
-          let $chat_box = $('#chat-box');
-          let lastMsgPos = scrollTopOfBottom($chat_box)
-
-          $('#loader').hide();
-
-          if (refresh_html) {
-            $('#chat-log').append(data);
-          }
-          else {
-            $('#chat-log').prepend(data);
-          }
-
-          register_time($('.time-with-rel'));
-          merge_authors();
-
-          if (!refresh_html) {
-            $chat_box.scrollTop(scrollTopOfBottom($chat_box) - lastMsgPos);
-          }
-          else {
-            $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
-          }
-          window.lock = false;
-          window.has_next = parseInt($(".has_next").attr("value"));
-        }, time);
-      })
-    }
-
-    function scrollTopOfBottom(container) {
-      return container[0].scrollHeight - container.innerHeight()
-    }
-
-    function scrollContainer(container, loader) {
-      container.scroll(function() {
-        if (container.scrollTop() == 0) {
-          if (!window.lock && window.has_next) {
-            loader.show();
-            var message_ids = $('.message').map(function() {
-              return parseInt($(this).attr('message-id'));
-            }).get();
-            load_next_page(Math.min(...message_ids));
-          }
-        }
-      })}
-
     window.load_dynamic_update = function (last_msg) {
       var receiver = new EventReceiver(
         "{{ EVENT_DAEMON_LOCATION }}", "{{ EVENT_DAEMON_POLL_LOCATION }}",
-        ['chat_lobby', 'chat_{{request.profile.id}}'], last_msg, function (message) {
+        ['{{chat_lobby_channel}}', '{{chat_channel}}'], last_msg, function (message) {
           if (window.pushed_messages.has(message.message)) {
             return;
           }
@@ -115,484 +42,8 @@
 
       return receiver;
     }
-
-    function refresh_status() {
-      $.get("{{url('online_status_ajax')}}")
-        .fail(function() {
-        console.log("Fail to get online status");
-      })
-        .done(function(data) {
-        if (data.status == 403) {
-          console.log("Fail to retrieve data");
-        }
-        else {
-          $('#chat-online-list').html(data).find('.toggle').each(function () {
-            register_toggle($(this));
-          });
-          register_click_space();
-        }
-      })
-
-      var data = {
-        'user': window.other_user_id,
-      };
-
-      $.get("{{url('user_online_status_ajax')}}", data)
-        .fail(function() {
-        console.log("Fail to get user online status");
-      })
-        .done(function(data) {
-        $('#chat-info').html(data);
-        register_time($('.time-with-rel'));
-        register_setting();
-      })
-    }
-
-    function add_message(data) {
-      var $data = $(data);
-
-      $('#chat-log').append($data);
-      $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
-      register_time($('.time-with-rel'));
-      MathJax.typeset();
-      merge_authors();
-    }
-
-    function add_new_message(message, room, is_self_author) {
-      function callback(update) {
-        if (!document['hidden']) {
-          if (update) update_last_seen();
-          refresh_status();
-        }
-        else if (!is_self_author) {
-          window.unread_message++;
-          document.title = "(" + window.unread_message + ") " + "{{ _('New message(s)') }}";
-        }
-      }
-
-      if (room == window.room_id) {
-        $.get({
-          url: "{{ url('chat_message_ajax') }}",
-          data: {
-            message: message,
-          },
-          success: function (data) {
-            add_message(data);
-            callback(true);
-          },
-          error: function (data) {
-            console.log('Could not add new message');
-          }
-        });
-      }
-      else {
-        callback(false);
-      }
-    }
-
-    function check_new_message(message, tmp_id, room) {
-      if (room == room_id) {
-        $.get({
-          url: "{{ url('chat_message_ajax') }}",
-          data: {
-            message: message,
-          },
-          success: function (data) {
-            var $body_block = $(data).find('.body-block');
-            if ($('#message-'+tmp_id).length) {
-              $('#message-'+tmp_id).replaceWith(data);
-            }
-            else if ($('#body-block-'+tmp_id).length) {
-              $('#body-block-'+tmp_id).replaceWith($body_block);
-            }
-            else {
-              add_new_message(message, room, true);
-            }
-            MathJax.typeset();
-            register_time($('.time-with-rel'));
-            remove_unread_current_user();
-            merge_authors();
-          },
-          error: function (data) {
-            console.log('Fail to check message');
-            var $body = $('#body-block-'+tmp_id + ' p');
-            $body.css('text-decoration', 'line-through');
-            $body.css('text-decoration-color', 'red');
-          }
-        });
-      }
-    }
-
-    function merge_authors() {
-      var time_limit = 5; // minutes
-      var last = {
-        username: null,
-        time: null,
-        $content: null
-      };
-      $('.body-message').each(function() {
-        var username = $(this).find(".username a").text().trim();
-        var $body = $(this).find(".content-message .body-block");
-        var time = moment($(this).find(".time-with-rel").attr('data-iso'));
-        var $content = $(this).children('.content-message');
-
-        if (username == window.user.name) {
-          $(this).find('.message-text').each(function() {
-            $(this).removeClass('message-text-other').addClass('message-text-myself');
-          });
-        }
-
-        if (username == last.username && time.diff(last.time, 'minutes') <= time_limit) {
-          last.$content.append($body);
-          $(this).parent().remove();
-        }
-        else {
-          last.username = username;
-          last.time = time;
-          last.$content = $content;
-        }
-      });
-    }
-
-    function add_message_from_template(body, tmp_id) {
-      var html = message_template;
-      html = html.replaceAll('$body', body).replaceAll('$id', tmp_id);
-      var $html = $(html);
-      $html.find('.time-with-rel').attr('data-iso', (new Date()).toISOString());
-      add_message($html[0].outerHTML);
-    }
-
-    function submit_chat() {
-      {% if last_msg and not request.profile.mute %}
-        if ($("#chat-input").val().trim()) {
-          var body = $('#chat-input').val().trim();
-          // body = body.split('\n').join('\n\n');
-
-          var message = {
-            body: body,
-            room: window.room_id,
-            tmp_id: Date.now(),
-          };
-
-          $('#chat-input').val('');
-
-          add_message_from_template(body, message.tmp_id);
-
-          $.post("{{ url('post_chat_message') }}", message)
-            .fail(function(res) {
-            console.log('Fail to send message');
-          })
-            .done(function(res, status) {
-            $('#empty_msg').hide();
-            $('#chat-input').focus();
-          })
-        }
-      {% endif %}
-    }
-
-    function resize_emoji(element) {
-      var html = element.html();
-      html = html.replace(/(\p{Extended_Pictographic})/ug, `<span class="big-emoji">$1</span>`);
-      element.html(html);
-    }
-
-    function insert_char_after_cursor(elem, char) {
-      var val = elem.value;
-      if (typeof elem.selectionStart == "number" && typeof elem.selectionEnd == "number") {
-        var start = elem.selectionStart;
-        var prefix = elem.value.slice(0, start);
-        var prefix_added = prefix + char;
-        var chars = [...val];
-        chars.splice([...prefix].length, 0, char);
-        elem.value = chars.join('');
-        elem.selectionStart = elem.selectionEnd = prefix_added.length;
-      } else if (document.selection && document.selection.createRange) {
-        var range = document.selection.createRange();
-        elem.focus();
-        range.text = char;
-        range.collapse(false);
-        range.select();
-      }
-    }
-
-    function load_room(encrypted_user) {
-      if (window.lock_click_space) return;
-
-      function callback() {
-        history.replaceState(null, '', "{{url('chat', '')}}" + window.room_id);
-        load_next_page(null, true);
-        update_last_seen();
-        refresh_status();
-        $('#chat-input').focus();
-      }
-      window.lock_click_space = true;
-      if (encrypted_user) {
-        $.get("{{url('get_or_create_room')}}" + `?other=${encrypted_user}`)
-          .done(function(data) {
-          window.room_id = data.room;
-          window.other_user_id = data.other_user_id;
-          callback();
-        })
-          .fail(function() {
-          console.log('Fail to get_or_create_room');
-        })
-      }
-      else {
-        window.room_id = '';
-        window.other_user_id = '';
-        callback();
-      }
-      window.lock_click_space = false;
-    }
-
-    function register_click_space() {
-      $('.click_space').on('click', function(e) {
-        if ($(this).attr('id') == 'click_space_' + window.other_user_id) {
-          return;
-        }
-        var other_user = $(this).attr('value');
-        load_room(other_user);
-      });
-      $('#lobby_row').on('click', function(e) {
-        if (window.room_id) {
-          load_room(null);
-        }
-      });
-      if (isMobile) {
-        $('#chat-tab a').click();
-      }
-    }
-
-    function update_last_seen() {
-      var data = {
-        room: window.room_id
-      };
-
-      $.post("{{ url('update_last_seen') }}", data)
-        .fail(function(data) {
-        console.log('Fail to update last seen');
-      })
-        .done(function(data) {
-
-      })
-    }
-
-    function remove_unread_current_user() {
-      if (window.other_user_id) {
-        $("#unread-count-" + window.other_user_id).hide();
-      }
-      else {
-        $('#unread-count-lobby').hide();
-      }
-    }
-
-    function register_setting() {
-      $('#setting-button').on('click', function() {
-        $('#setting-content').toggle();
-      });
-      $('#setting-content li').on('click', function() {
-        $(this).children('a')[0].click();
-      })
-      $('#setting-content a').on('click', function() {
-        var href = $(this).attr('href');
-        href += '?next=' + window.location.pathname;
-        $(this).attr('href', href);
-      })
-    }
-
     $(function() {
-      $('#loader').hide();
-      merge_authors();
-      window.has_next = parseInt($(".has_next").attr("value"));
-
-      scrollContainer($('#chat-box'), $('#loader'))
-
-      {% if request.user.is_staff %}
-        $(document).on("click", ".chat_remove", function() {
-          var elt = $(this);
-          $.ajax({
-            url: "{{ url('delete_chat_message') }}",
-            type: 'post',
-            data: {
-              message: elt.attr('value'),
-            },
-            dataType: 'json',
-            success: function(data){
-              var $block = elt.parent();
-              if ($block.parent().find('.body-block').length > 1) {
-                $block.remove();
-              }
-              else {
-                elt.closest('li').remove();
-              }
-            },
-            fail: function(data) {
-              console.log('Fail to delete');
-            },
-          });
-        });
-        $(document).on("click", ".chat_mute", function() {
-          if (confirm("{{_('Mute this user and delete all messages?')}}")) {
-            var elt = $(this);
-            $.ajax({
-              url: "{{ url('mute_chat_message') }}",
-              type: 'post',
-              data: {
-                message: elt.attr('value'),
-              },
-              dataType: 'json',
-              success: function(data){
-                window.location.reload();
-              },
-              fail: function(data) {
-                console.log('Fail to delete');
-              },
-            });
-          }
-        });
-      {% endif %}
-
-      $("#chat-log").show();
-      $("#chat-log").change(function() {
-        $('#chat-log').scrollTop($('#chat-log')[0].scrollHeight);
-      });
-
-      $('#chat-input').focus();
-
-      $('#chat-input').keydown(function(e) {
-        if (e.keyCode === 13) {
-          if (e.ctrlKey || e.shiftKey) {
-            insert_char_after_cursor(this, "\n");
-          }
-          else {
-            e.preventDefault();
-            submit_chat();
-          }
-          return false
-        }
-        return true
-      });
-
-      $('.chat-right-panel').hide();
-      $('#chat-tab').find('a').click(function (e) {
-        e.preventDefault();
-        $('#chat-tab').addClass('active');
-        $('#online-tab').removeClass('active');
-        $('.chat-left-panel').show();
-        $('.chat-right-panel').hide();
-      });
-      $('#online-tab').find('a').click(function (e) {
-        e.preventDefault();
-        $('#online-tab').addClass('active');
-        $('#chat-tab').removeClass('active');
-        $('.chat-left-panel').hide();
-        $('.chat-right-panel').show();
-      });
-
-      $('#refresh-button').on('click', function(e) {
-        e.preventDefault();
-        refresh_status();
-      });
-
-      setInterval(refresh_status, 2 * 60 * 1000);
-
-      $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
       load_dynamic_update({{last_msg}});
-
-      const button = document.querySelector('#emoji-button');
-      const tooltip = document.querySelector('.tooltip');
-      Popper.createPopper(button, tooltip, {
-        placement: 'left-end',
-      });
-
-      function toggleEmoji() {
-        tooltip.classList.toggle('shown')
-      }
-      $('#emoji-button').on('click', function(e) {
-        e.preventDefault();
-        e.stopPropagation();
-        toggleEmoji();
-      });
-
-      // Đóng bảng emoji khi click bất kỳ chỗ nào trên màn hình
-      document.addEventListener("click", function(e) {
-        if (!tooltip.contains(e.target)) {
-          tooltip.classList.remove('shown'); // Ẩn bảng emoji
-        }
-      });
-
-      $('emoji-picker').on('emoji-click', function(e) {
-        var $chat = $('#chat-input').get(0);
-        insert_char_after_cursor($chat, e.detail.unicode);
-        $chat.focus();
-      })
-
-      register_click_space();
-
-      document.addEventListener('keydown', function(e) {
-        if (e.keyCode === 27 && $('.tooltip').hasClass('shown')) {
-          toggleEmoji();
-        }
-      })
-
-      $('#search-handle').replaceWith($('<select>').attr({
-        id: 'search-handle',
-        name: 'other',
-        onchange: 'form.submit()'
-      }));
-
-      var in_user_redirect = false;
-      $('#search-handle').select2({
-        placeholder: '{{ _('Search by handle...') }}',
-        ajax: {
-          url: '{{ url('chat_user_search_select2_ajax') }}'
-        },
-        minimumInputLength: 1,
-        escapeMarkup: function (markup) {
-          return markup;
-        },
-        templateResult: function (data, container) {
-          return $('<span>')
-            .append($('<img>', {
-            'class': 'user-search-image', src: data.gravatar_url,
-            width: 24, height: 24
-          }))
-            .append($('<span>', {'class': data.display_rank + ' user-search-name'}).text(data.text))
-            .append($('<a>', {href: '/user/' + data.text, 'class': 'user-redirect'})
-              .append($('<i>', {'class': 'fa fa-mail-forward'}))
-              .mouseover(function () {
-              in_user_redirect = true;
-            }).mouseout(function () {
-              in_user_redirect = false;
-            }));
-        }
-      }).on('select2:selecting', function () {
-        return !in_user_redirect;
-      });
-
-      $("#chat-input").on("keyup", function() {
-        $("#chat-input").scrollTop($("#chat-input")[0].scrollHeight);
-      });
-
-      // https://stackoverflow.com/questions/42121565/detecting-class-change-without-setinterval
-      if (typeof(MutationObserver) !== undefined) {
-        var observer = new MutationObserver(function (event) {
-          if (!document['hidden'] && window.unread_message > 0) {
-            update_last_seen();
-            refresh_status();
-            window.unread_message = 0;
-            document.title = "{{_('Chat Box')}}";
-          }
-        })
-
-        observer.observe(document.body, {
-          attributes: true,
-          attributeFilter: ['class'],
-          childList: false,
-          characterData: false
-        })
-      }
-      register_setting();
     });
   </script>
 
@@ -638,8 +89,7 @@
           {% include 'chat/user_online_status.html' %}
         </div>
         <div id="chat-box">
-
-          <img src="{{static('loading.gif')}}" id="loader" height="2em">
+          <img src="{{static('loading.gif')}}" id="loader">
           <ul id="chat-log" style="display: none">
             {% include 'chat/message_list.html' %}
           </ul>
diff --git a/templates/chat/chat_css.html b/templates/chat/chat_css.html
index f5bf8cd..d79a22b 100644
--- a/templates/chat/chat_css.html
+++ b/templates/chat/chat_css.html
@@ -1,132 +1,134 @@
-<style>
-  footer {
-    display: none;
-  }
-
-  #content {
-    padding-top: 0;
-  }
-
-  ::-webkit-scrollbar {
-    width: 20px;
-  }
-
-  ::-webkit-scrollbar-track {
-    background-color: transparent;
-  }
-
-  ::-webkit-scrollbar-thumb {
-    background-color: #d6dee1;
-    border-radius: 20px;
-    border: 6px solid transparent;
-    background-clip: content-box;
-  }
-
-  ::-webkit-scrollbar-thumb:hover {
-    background-color: #a8bbbf;
-  }
-
-  #page-container {
-    width: 100%;
-  }
-
-  .body-message img{
-    max-height: 12em;
-  }
-
-  .tooltip:not(.shown) {
-    display: none;
-  }
-
-  textarea {
-    resize: none;
-  }
-
-  .tooltip {
-    position: absolute;
-    z-index: 1000;
-  }
-
-  #loader {
-    display: block;
-    margin-left: auto;
-    margin-right: auto;
-    width: 4%;
-  }
-  .profile-pic {
-    height: 2.6em;
-    width: 2.6em;
-    border-radius: 0.3em;
-    margin-top: 0.1em;
-    float: left;
-  }
-  .body-message {
-    padding-left: 3em;
-    padding-bottom: 0.5em;
-    border-bottom: 1px dotted lightgray;
-  }
-  .user-time {
-    margin-bottom: 0.3em;
-  }
-  .time {
-    margin-left: 0.5em;
-  }
-  .clear {
-    clear: both;
-  }
-  .content-message {
-    word-wrap: break-word;
-  }
-  .content-message p {
-    margin: 0;
-  }
-  #content {
-    width: 100%;
-  }
-  #content-body {
-    padding-bottom: 0;
-  }
-  #page-container {
-    min-height: 0;
-  }
-  .sidebox h3 {
-    border-radius: 0;
-  }
-  .body-block {
-    border-radius: 4px;
-    padding: 0.05em 0.6em;
-    width: 100%;
-  }
-  #search-form {
-    float: inherit;
-  }
-  #search-container {
-    margin-bottom: 0.4em;
-  }
-  #setting {
-    position: relative;
-  }
-
-
-  @media (min-width: 800px) {
-    #page-container {
-      position:fixed;
-      overflow:hidden;
-    }
-  }
-  @media (max-width: 799px) {
-    html, body {
-      max-width: 100%;
-      overflow-x: hidden;
-    }
-    #mobile ul {
-      width: 100%;
-    }
-    .info-pic {
-      margin-left: 0.5em;
-    }
-    .active-span {
+{% compress css %}
+  <style>
+    footer {
       display: none;
     }
-  }
-</style>
+
+    #content {
+      padding-top: 0;
+    }
+
+    ::-webkit-scrollbar {
+      width: 20px;
+    }
+
+    ::-webkit-scrollbar-track {
+      background-color: transparent;
+    }
+
+    ::-webkit-scrollbar-thumb {
+      background-color: #d6dee1;
+      border-radius: 20px;
+      border: 6px solid transparent;
+      background-clip: content-box;
+    }
+
+    ::-webkit-scrollbar-thumb:hover {
+      background-color: #a8bbbf;
+    }
+
+    #page-container {
+      width: 100%;
+    }
+
+    .body-message img{
+      max-height: 12em;
+    }
+
+    .tooltip:not(.shown) {
+      display: none;
+    }
+
+    textarea {
+      resize: none;
+    }
+
+    .tooltip {
+      position: absolute;
+      z-index: 1000;
+    }
+
+    #loader {
+      display: block;
+      margin-left: auto;
+      margin-right: auto;
+      width: 80px;
+    }
+    .profile-pic {
+      height: 2.6em;
+      width: 2.6em;
+      border-radius: 0.3em;
+      margin-top: 0.1em;
+      float: left;
+    }
+    .body-message {
+      padding-left: 3em;
+      padding-bottom: 0.5em;
+      border-bottom: 1px dotted lightgray;
+    }
+    .user-time {
+      margin-bottom: 0.3em;
+    }
+    .time {
+      margin-left: 0.5em;
+    }
+    .clear {
+      clear: both;
+    }
+    .content-message {
+      word-wrap: break-word;
+    }
+    .content-message p {
+      margin: 0;
+    }
+    #content {
+      width: 100%;
+    }
+    #content-body {
+      padding-bottom: 0;
+    }
+    #page-container {
+      min-height: 0;
+    }
+    .sidebox h3 {
+      border-radius: 0;
+    }
+    .body-block {
+      border-radius: 4px;
+      padding: 0.05em 0.6em;
+      width: 100%;
+    }
+    #search-form {
+      float: inherit;
+    }
+    #search-container {
+      margin-bottom: 0.4em;
+    }
+    #setting {
+      position: relative;
+    }
+
+
+    @media (min-width: 800px) {
+      #page-container {
+        position:fixed;
+        overflow:hidden;
+      }
+    }
+    @media (max-width: 799px) {
+      html, body {
+        max-width: 100%;
+        overflow-x: hidden;
+      }
+      #mobile ul {
+        width: 100%;
+      }
+      .info-pic {
+        margin-left: 0.5em;
+      }
+      .active-span {
+        display: none;
+      }
+    }
+  </style>
+{% endcompress %}
\ No newline at end of file
diff --git a/templates/chat/chat_js.html b/templates/chat/chat_js.html
new file mode 100644
index 0000000..116d949
--- /dev/null
+++ b/templates/chat/chat_js.html
@@ -0,0 +1,553 @@
+<script type="text/javascript">
+  let message_template = `
+{% with message=message_template %}
+  {% include "chat/message.html" %}
+{% endwith %}  
+  `;
+  let META_HEADER = [
+    "{{_('Recent')}}",
+    "{{_('Following')}}",
+    "{{_('Admin')}}",
+    "{{_('Other')}}",
+  ];
+  function load_next_page(last_id, refresh_html=false) {
+    var param = {
+      'last_id': last_id,
+      'only_messages': true,
+    }
+    $.get("{{ url('chat', '') }}" + window.room_id, param)
+      .fail(function() {
+      console.log("Fail to load page, last_id = " + last_id);
+    })
+      .done(function(data) {
+      if (refresh_html) {
+        $('#chat-log').html('');
+        $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
+        window.lock = true;
+      }
+      var time = refresh_html ? 0 : 200;
+
+      setTimeout(function() {
+        $(".has_next").remove();
+        let $chat_box = $('#chat-box');
+        let lastMsgPos = scrollTopOfBottom($chat_box)
+
+        $('#loader').hide();
+
+        if (refresh_html) {
+          $('#chat-log').append(data);
+        }
+        else {
+          $('#chat-log').prepend(data);
+        }
+
+        register_time($('.time-with-rel'));
+        merge_authors();
+
+        if (!refresh_html) {
+          $chat_box.scrollTop(scrollTopOfBottom($chat_box) - lastMsgPos);
+        }
+        else {
+          $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
+        }
+        window.lock = false;
+        window.has_next = parseInt($(".has_next").attr("value"));
+      }, time);
+    })
+  }
+
+  function scrollTopOfBottom(container) {
+    return container[0].scrollHeight - container.innerHeight()
+  }
+
+  function scrollContainer(container, loader) {
+    container.scroll(function() {
+      if (container.scrollTop() == 0) {
+        if (!window.lock && window.has_next) {
+          loader.show();
+          var message_ids = $('.message').map(function() {
+            return parseInt($(this).attr('message-id'));
+          }).get();
+          load_next_page(Math.min(...message_ids));
+        }
+      }
+    })}
+
+  function refresh_status() {
+    $.get("{{url('online_status_ajax')}}")
+      .fail(function() {
+      console.log("Fail to get online status");
+    })
+      .done(function(data) {
+      if (data.status == 403) {
+        console.log("Fail to retrieve data");
+      }
+      else {
+        $('#chat-online-list').html(data).find('.toggle').each(function () {
+          register_toggle($(this));
+        });
+        register_click_space();
+      }
+    })
+
+    var data = {
+      'user': window.other_user_id,
+    };
+
+    $.get("{{url('user_online_status_ajax')}}", data)
+      .fail(function() {
+      console.log("Fail to get user online status");
+    })
+      .done(function(data) {
+      $('#chat-info').html(data);
+      register_time($('.time-with-rel'));
+      register_setting();
+    })
+  }
+
+  function add_message(data) {
+    var $data = $(data);
+
+    $('#chat-log').append($data);
+    $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
+    register_time($('.time-with-rel'));
+    MathJax.typeset();
+    merge_authors();
+  }
+
+  function add_new_message(message, room, is_self_author) {
+    function callback(update) {
+      if (!document['hidden']) {
+        if (update) update_last_seen();
+        refresh_status();
+      }
+      else if (!is_self_author) {
+        window.unread_message++;
+        document.title = "(" + window.unread_message + ") " + "{{ _('New message(s)') }}";
+      }
+    }
+
+    if (room == window.room_id) {
+      $.get({
+        url: "{{ url('chat_message_ajax') }}",
+        data: {
+          message: message,
+        },
+        success: function (data) {
+          add_message(data);
+          callback(true);
+        },
+        error: function (data) {
+          console.log('Could not add new message');
+        }
+      });
+    }
+    else {
+      callback(false);
+    }
+  }
+
+  function check_new_message(message, tmp_id, room) {
+    if (room == room_id) {
+      $.get({
+        url: "{{ url('chat_message_ajax') }}",
+        data: {
+          message: message,
+        },
+        success: function (data) {
+          var $body_block = $(data).find('.body-block');
+          if ($('#message-'+tmp_id).length) {
+            $('#message-'+tmp_id).replaceWith(data);
+          }
+          else if ($('#body-block-'+tmp_id).length) {
+            $('#body-block-'+tmp_id).replaceWith($body_block);
+          }
+          else {
+            add_new_message(message, room, true);
+          }
+          MathJax.typeset();
+          register_time($('.time-with-rel'));
+          remove_unread_current_user();
+          merge_authors();
+        },
+        error: function (data) {
+          console.log('Fail to check message');
+          var $body = $('#body-block-'+tmp_id + ' p');
+          $body.css('text-decoration', 'line-through');
+          $body.css('text-decoration-color', 'red');
+        }
+      });
+    }
+  }
+
+  function merge_authors() {
+    var time_limit = 5; // minutes
+    var last = {
+      username: null,
+      time: null,
+      $content: null
+    };
+    $('.body-message').each(function() {
+      var username = $(this).find(".username a").text().trim();
+      var $body = $(this).find(".content-message .body-block");
+      var time = moment($(this).find(".time-with-rel").attr('data-iso'));
+      var $content = $(this).children('.content-message');
+
+      if (username == window.user.name) {
+        $(this).find('.message-text').each(function() {
+          $(this).removeClass('message-text-other').addClass('message-text-myself');
+        });
+      }
+
+      if (username == last.username && time.diff(last.time, 'minutes') <= time_limit) {
+        last.$content.append($body);
+        $(this).parent().remove();
+      }
+      else {
+        last.username = username;
+        last.time = time;
+        last.$content = $content;
+      }
+    });
+  }
+
+  function add_message_from_template(body, tmp_id) {
+    var html = message_template;
+    html = html.replaceAll('$body', body).replaceAll('$id', tmp_id);
+    var $html = $(html);
+    $html.find('.time-with-rel').attr('data-iso', (new Date()).toISOString());
+    add_message($html[0].outerHTML);
+  }
+
+  function submit_chat() {
+    {% if last_msg and not request.profile.mute %}
+      if ($("#chat-input").val().trim()) {
+        var body = $('#chat-input').val().trim();
+        // body = body.split('\n').join('\n\n');
+
+        var message = {
+          body: body,
+          room: window.room_id,
+          tmp_id: Date.now(),
+        };
+
+        $('#chat-input').val('');
+
+        add_message_from_template(body, message.tmp_id);
+
+        $.post("{{ url('post_chat_message') }}", message)
+          .fail(function(res) {
+          console.log('Fail to send message');
+        })
+          .done(function(res, status) {
+          $('#empty_msg').hide();
+          $('#chat-input').focus();
+        })
+      }
+    {% endif %}
+  }
+
+  function resize_emoji(element) {
+    var html = element.html();
+    html = html.replace(/(\p{Extended_Pictographic})/ug, `<span class="big-emoji">$1</span>`);
+    element.html(html);
+  }
+
+  function insert_char_after_cursor(elem, char) {
+    var val = elem.value;
+    if (typeof elem.selectionStart == "number" && typeof elem.selectionEnd == "number") {
+      var start = elem.selectionStart;
+      var prefix = elem.value.slice(0, start);
+      var prefix_added = prefix + char;
+      var chars = [...val];
+      chars.splice([...prefix].length, 0, char);
+      elem.value = chars.join('');
+      elem.selectionStart = elem.selectionEnd = prefix_added.length;
+    } else if (document.selection && document.selection.createRange) {
+      var range = document.selection.createRange();
+      elem.focus();
+      range.text = char;
+      range.collapse(false);
+      range.select();
+    }
+  }
+
+  function load_room(encrypted_user) {
+    if (window.lock_click_space) return;
+
+    function callback() {
+      history.replaceState(null, '', "{{url('chat', '')}}" + window.room_id);
+      load_next_page(null, true);
+      update_last_seen();
+      refresh_status();
+      $('#chat-input').focus();
+    }
+    window.lock_click_space = true;
+    if (encrypted_user) {
+      $.get("{{url('get_or_create_room')}}" + `?other=${encrypted_user}`)
+        .done(function(data) {
+        window.room_id = data.room;
+        window.other_user_id = data.other_user_id;
+        callback();
+      })
+        .fail(function() {
+        console.log('Fail to get_or_create_room');
+      })
+    }
+    else {
+      window.room_id = '';
+      window.other_user_id = '';
+      callback();
+    }
+    window.lock_click_space = false;
+  }
+
+  function register_click_space() {
+    $('.click_space').on('click', function(e) {
+      if ($(this).attr('id') == 'click_space_' + window.other_user_id) {
+        return;
+      }
+      var other_user = $(this).attr('value');
+      load_room(other_user);
+    });
+    $('#lobby_row').on('click', function(e) {
+      if (window.room_id) {
+        load_room(null);
+      }
+    });
+    if (isMobile) {
+      $('#chat-tab a').click();
+    }
+  }
+
+  function update_last_seen() {
+    var data = {
+      room: window.room_id
+    };
+
+    $.post("{{ url('update_last_seen') }}", data)
+      .fail(function(data) {
+      console.log('Fail to update last seen');
+    })
+      .done(function(data) {
+
+    })
+  }
+
+  function remove_unread_current_user() {
+    if (window.other_user_id) {
+      $("#unread-count-" + window.other_user_id).hide();
+    }
+    else {
+      $('#unread-count-lobby').hide();
+    }
+  }
+
+  function register_setting() {
+    $('#setting-button').on('click', function() {
+      $('#setting-content').toggle();
+    });
+    $('#setting-content li').on('click', function() {
+      $(this).children('a')[0].click();
+    })
+    $('#setting-content a').on('click', function() {
+      var href = $(this).attr('href');
+      href += '?next=' + window.location.pathname;
+      $(this).attr('href', href);
+    })
+  }
+  $(function() {
+    $('#loader').hide();
+    update_last_seen();
+    merge_authors();
+    window.has_next = parseInt($(".has_next").attr("value"));
+
+    scrollContainer($('#chat-box'), $('#loader'))
+
+    {% if request.user.is_staff %}
+      $(document).on("click", ".chat_remove", function() {
+        var elt = $(this);
+        $.ajax({
+          url: "{{ url('delete_chat_message') }}",
+          type: 'post',
+          data: {
+            message: elt.attr('value'),
+          },
+          dataType: 'json',
+          success: function(data){
+            var $block = elt.parent();
+            if ($block.parent().find('.body-block').length > 1) {
+              $block.remove();
+            }
+            else {
+              elt.closest('li').remove();
+            }
+          },
+          fail: function(data) {
+            console.log('Fail to delete');
+          },
+        });
+      });
+      $(document).on("click", ".chat_mute", function() {
+        if (confirm("{{_('Mute this user and delete all messages?')}}")) {
+          var elt = $(this);
+          $.ajax({
+            url: "{{ url('mute_chat_message') }}",
+            type: 'post',
+            data: {
+              message: elt.attr('value'),
+            },
+            dataType: 'json',
+            success: function(data){
+              window.location.reload();
+            },
+            fail: function(data) {
+              console.log('Fail to delete');
+            },
+          });
+        }
+      });
+    {% endif %}
+
+    $("#chat-log").show();
+    $("#chat-log").change(function() {
+      $('#chat-log').scrollTop($('#chat-log')[0].scrollHeight);
+    });
+
+    $('#chat-input').focus();
+
+    $('#chat-input').keydown(function(e) {
+      if (e.keyCode === 13) {
+        if (e.ctrlKey || e.shiftKey) {
+          insert_char_after_cursor(this, "\n");
+        }
+        else {
+          e.preventDefault();
+          submit_chat();
+        }
+        return false
+      }
+      return true
+    });
+
+    $('.chat-right-panel').hide();
+    $('#chat-tab').find('a').click(function (e) {
+      e.preventDefault();
+      $('#chat-tab').addClass('active');
+      $('#online-tab').removeClass('active');
+      $('.chat-left-panel').show();
+      $('.chat-right-panel').hide();
+    });
+    $('#online-tab').find('a').click(function (e) {
+      e.preventDefault();
+      $('#online-tab').addClass('active');
+      $('#chat-tab').removeClass('active');
+      $('.chat-left-panel').hide();
+      $('.chat-right-panel').show();
+    });
+
+    $('#refresh-button').on('click', function(e) {
+      e.preventDefault();
+      refresh_status();
+    });
+
+    setInterval(refresh_status, 2 * 60 * 1000);
+
+    $('#chat-box').scrollTop($('#chat-box')[0].scrollHeight);
+
+    const button = document.querySelector('#emoji-button');
+    const tooltip = document.querySelector('.tooltip');
+    Popper.createPopper(button, tooltip, {
+      placement: 'left-end',
+    });
+
+    function toggleEmoji() {
+      tooltip.classList.toggle('shown')
+    }
+    $('#emoji-button').on('click', function(e) {
+      e.preventDefault();
+      e.stopPropagation();
+      toggleEmoji();
+    });
+
+    // Đóng bảng emoji khi click bất kỳ chỗ nào trên màn hình
+    document.addEventListener("click", function(e) {
+      if (!tooltip.contains(e.target)) {
+        tooltip.classList.remove('shown'); // Ẩn bảng emoji
+      }
+    });
+
+    $('emoji-picker').on('emoji-click', function(e) {
+      var $chat = $('#chat-input').get(0);
+      insert_char_after_cursor($chat, e.detail.unicode);
+      $chat.focus();
+    })
+
+    register_click_space();
+
+    document.addEventListener('keydown', function(e) {
+      if (e.keyCode === 27 && $('.tooltip').hasClass('shown')) {
+        toggleEmoji();
+      }
+    })
+
+    $('#search-handle').replaceWith($('<select>').attr({
+      id: 'search-handle',
+      name: 'other',
+      onchange: 'form.submit()'
+    }));
+
+    var in_user_redirect = false;
+    $('#search-handle').select2({
+      placeholder: '{{ _('Search by handle...') }}',
+      ajax: {
+        url: '{{ url('chat_user_search_select2_ajax') }}'
+      },
+      minimumInputLength: 1,
+      escapeMarkup: function (markup) {
+        return markup;
+      },
+      templateResult: function (data, container) {
+        return $('<span>')
+          .append($('<img>', {
+          'class': 'user-search-image', src: data.gravatar_url,
+          width: 24, height: 24
+        }))
+          .append($('<span>', {'class': data.display_rank + ' user-search-name'}).text(data.text))
+          .append($('<a>', {href: '/user/' + data.text, 'class': 'user-redirect'})
+            .append($('<i>', {'class': 'fa fa-mail-forward'}))
+            .mouseover(function () {
+            in_user_redirect = true;
+          }).mouseout(function () {
+            in_user_redirect = false;
+          }));
+      }
+    }).on('select2:selecting', function () {
+      return !in_user_redirect;
+    });
+
+    $("#chat-input").on("keyup", function() {
+      $("#chat-input").scrollTop($("#chat-input")[0].scrollHeight);
+    });
+
+    // https://stackoverflow.com/questions/42121565/detecting-class-change-without-setinterval
+    if (typeof(MutationObserver) !== undefined) {
+      var observer = new MutationObserver(function (event) {
+        if (!document['hidden'] && window.unread_message > 0) {
+          update_last_seen();
+          refresh_status();
+          window.unread_message = 0;
+          document.title = "{{_('Chat Box')}}";
+        }
+      })
+
+      observer.observe(document.body, {
+        attributes: true,
+        attributeFilter: ['class'],
+        childList: false,
+        characterData: false
+      })
+    }
+    register_setting();
+  });
+</script>
\ No newline at end of file