diff --git a/chat_box/models.py b/chat_box/models.py
index fb3fd7b..fb6de76 100644
--- a/chat_box/models.py
+++ b/chat_box/models.py
@@ -18,6 +18,9 @@ class Room(models.Model):
         Profile, related_name="user_two", verbose_name="user 2", on_delete=CASCADE
     )
 
+    class Meta:
+        app_label = "chat_box"
+
     @cache_wrapper(prefix="Rc")
     def contain(self, profile):
         return self.user_one == profile or self.user_two == profile
@@ -58,6 +61,7 @@ class Message(models.Model):
         indexes = [
             models.Index(fields=["hidden", "room", "-id"]),
         ]
+        app_label = "chat_box"
 
 
 class UserRoom(models.Model):
@@ -70,6 +74,7 @@ class UserRoom(models.Model):
 
     class Meta:
         unique_together = ("user", "room")
+        app_label = "chat_box"
 
 
 class Ignore(models.Model):
@@ -82,6 +87,9 @@ class Ignore(models.Model):
     )
     ignored_users = models.ManyToManyField(Profile)
 
+    class Meta:
+        app_label = "chat_box"
+
     @classmethod
     def is_ignored(self, current_user, new_friend):
         try:
diff --git a/judge/admin/problem.py b/judge/admin/problem.py
index 49a145d..b5cd56f 100644
--- a/judge/admin/problem.py
+++ b/judge/admin/problem.py
@@ -25,6 +25,7 @@ from judge.models import (
     Solution,
     Notification,
 )
+from judge.models.notification import make_notification
 from judge.widgets import (
     AdminHeavySelect2MultipleWidget,
     AdminSelect2MultipleWidget,
@@ -381,14 +382,7 @@ class ProblemAdmin(CompareVersionAdmin):
             category = "Problem public: " + str(obj.is_public)
             if orgs:
                 category += " (" + ", ".join(orgs) + ")"
-            for user in users:
-                notification = Notification(
-                    owner=user,
-                    html_link=html,
-                    category=category,
-                    author=request.profile,
-                )
-                notification.save()
+            make_notification(users, html, category, request.profile)
 
     def construct_change_message(self, request, form, *args, **kwargs):
         if form.cleaned_data.get("change_message"):
diff --git a/judge/comments.py b/judge/comments.py
index 65d8f7e..dde97a0 100644
--- a/judge/comments.py
+++ b/judge/comments.py
@@ -26,21 +26,20 @@ from judge.dblock import LockModel
 from judge.models import Comment, Notification
 from judge.widgets import HeavyPreviewPageDownWidget
 from judge.jinja2.reference import get_user_from_text
+from judge.models.notification import make_notification
 
 
 DEFAULT_OFFSET = 10
 
 
+def _get_html_link_notification(comment):
+    return f'<a href="{comment.get_absolute_url()}">{comment.page_title}</a>'
+
+
 def add_mention_notifications(comment):
-    user_referred = get_user_from_text(comment.body).exclude(id=comment.author.id)
-    for user in user_referred:
-        notification_ref = Notification(owner=user, comment=comment, category="Mention")
-        notification_ref.save()
-
-
-def del_mention_notifications(comment):
-    query = {"comment": comment, "category": "Mention"}
-    Notification.objects.filter(**query).delete()
+    users_mentioned = get_user_from_text(comment.body).exclude(id=comment.author.id)
+    link = _get_html_link_notification(comment)
+    make_notification(users_mentioned, "Mention", link, comment.author)
 
 
 class CommentForm(ModelForm):
@@ -124,23 +123,17 @@ class CommentedDetailView(TemplateResponseMixin, SingleObjectMixin, View):
                 comment.save()
 
             # add notification for reply
+            comment_notif_link = _get_html_link_notification(comment)
             if comment.parent and comment.parent.author != comment.author:
-                notification_reply = Notification(
-                    owner=comment.parent.author, comment=comment, category="Reply"
+                make_notification(
+                    [comment.parent.author], "Reply", comment_notif_link, comment.author
                 )
-                notification_reply.save()
 
             # add notification for page authors
             page_authors = comment.linked_object.authors.all()
-            for user in page_authors:
-                if user == comment.author:
-                    continue
-                notification = Notification(
-                    owner=user, comment=comment, category="Comment"
-                )
-                notification.save()
-            # except Exception:
-            #     pass
+            make_notification(
+                page_authors, "Comment", comment_notif_link, comment.author
+            )
 
             add_mention_notifications(comment)
 
diff --git a/judge/migrations/0171_update_notification.py b/judge/migrations/0171_update_notification.py
new file mode 100644
index 0000000..7803e4b
--- /dev/null
+++ b/judge/migrations/0171_update_notification.py
@@ -0,0 +1,68 @@
+# Generated by Django 3.2.18 on 2023-10-10 21:17
+
+from django.db import migrations, models
+import django.db.models.deletion
+from django.urls import reverse
+
+from collections import defaultdict
+
+
+# Run this in shell
+def migrate_notif(apps, schema_editor):
+    Notification = apps.get_model("judge", "Notification")
+    Profile = apps.get_model("judge", "Profile")
+    NotificationProfile = apps.get_model("judge", "NotificationProfile")
+
+    unread_count = defaultdict(int)
+    for c in Notification.objects.all():
+        if c.comment:
+            c.html_link = (
+                f'<a href="{c.comment.get_absolute_url()}">{c.comment.page_title}</a>'
+            )
+            c.author = c.comment.author
+            c.save()
+        if c.read is False:
+            unread_count[c.author] += 1
+
+    for user in unread_count:
+        np = NotificationProfile(user=user)
+        np.unread_count = unread_count[user]
+        np.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("judge", "0170_contests_summary"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="contestssummary",
+            options={
+                "verbose_name": "contests summary",
+                "verbose_name_plural": "contests summaries",
+            },
+        ),
+        migrations.CreateModel(
+            name="NotificationProfile",
+            fields=[
+                (
+                    "id",
+                    models.AutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("unread_count", models.IntegerField(default=0)),
+                (
+                    "user",
+                    models.OneToOneField(
+                        on_delete=django.db.models.deletion.CASCADE, to="judge.profile"
+                    ),
+                ),
+            ],
+        ),
+    ]
diff --git a/judge/models/__init__.py b/judge/models/__init__.py
index 8226c96..2b1d706 100644
--- a/judge/models/__init__.py
+++ b/judge/models/__init__.py
@@ -6,7 +6,7 @@ from judge.models.choices import (
     MATH_ENGINES_CHOICES,
     TIMEZONE,
 )
-from judge.models.comment import Comment, CommentLock, CommentVote, Notification
+from judge.models.comment import Comment, CommentLock, CommentVote
 from judge.models.contest import (
     Contest,
     ContestMoss,
@@ -58,6 +58,7 @@ from judge.models.volunteer import VolunteerProblemVote
 from judge.models.pagevote import PageVote, PageVoteVoter
 from judge.models.bookmark import BookMark, MakeBookMark
 from judge.models.course import Course
+from judge.models.notification import Notification, NotificationProfile
 
 revisions.register(Profile, exclude=["points", "last_access", "ip", "rating"])
 revisions.register(Problem, follow=["language_limits"])
diff --git a/judge/models/comment.py b/judge/models/comment.py
index 6058cf8..2cbe20a 100644
--- a/judge/models/comment.py
+++ b/judge/models/comment.py
@@ -177,29 +177,3 @@ class CommentLock(models.Model):
 
     def __str__(self):
         return str(self.page)
-
-
-class Notification(models.Model):
-    owner = models.ForeignKey(
-        Profile,
-        verbose_name=_("owner"),
-        related_name="notifications",
-        on_delete=CASCADE,
-    )
-    time = models.DateTimeField(verbose_name=_("posted time"), auto_now_add=True)
-    comment = models.ForeignKey(
-        Comment, null=True, verbose_name=_("comment"), on_delete=CASCADE
-    )
-    read = models.BooleanField(verbose_name=_("read"), default=False)
-    category = models.CharField(verbose_name=_("category"), max_length=1000)
-    html_link = models.TextField(
-        default="",
-        verbose_name=_("html link to comments, used for non-comments"),
-        max_length=1000,
-    )
-    author = models.ForeignKey(
-        Profile,
-        null=True,
-        verbose_name=_("who trigger, used for non-comment"),
-        on_delete=CASCADE,
-    )
diff --git a/judge/models/notification.py b/judge/models/notification.py
new file mode 100644
index 0000000..01c5b0d
--- /dev/null
+++ b/judge/models/notification.py
@@ -0,0 +1,61 @@
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+from django.db.models import CASCADE, F
+from django.core.exceptions import ObjectDoesNotExist
+
+from judge.models import Profile, Comment
+from judge.caching import cache_wrapper
+
+
+class Notification(models.Model):
+    owner = models.ForeignKey(
+        Profile,
+        verbose_name=_("owner"),
+        related_name="notifications",
+        on_delete=CASCADE,
+    )
+    time = models.DateTimeField(verbose_name=_("posted time"), auto_now_add=True)
+    category = models.CharField(verbose_name=_("category"), max_length=1000)
+    html_link = models.TextField(
+        default="",
+        verbose_name=_("html link to comments, used for non-comments"),
+        max_length=1000,
+    )
+    author = models.ForeignKey(
+        Profile,
+        null=True,
+        verbose_name=_("who trigger, used for non-comment"),
+        on_delete=CASCADE,
+    )
+    comment = models.ForeignKey(
+        Comment, null=True, verbose_name=_("comment"), on_delete=CASCADE
+    )  # deprecated
+    read = models.BooleanField(verbose_name=_("read"), default=False)  # deprecated
+
+
+class NotificationProfile(models.Model):
+    unread_count = models.IntegerField(default=0)
+    user = models.OneToOneField(Profile, on_delete=CASCADE)
+
+
+def make_notification(to_users, category, html_link, author):
+    for user in to_users:
+        if user == author:
+            continue
+        notif = Notification(
+            owner=user, category=category, html_link=html_link, author=author
+        )
+        notif.save()
+        NotificationProfile.objects.get_or_create(user=user)
+        NotificationProfile.objects.filter(user=user).update(
+            unread_count=F("unread_count") + 1
+        )
+        unseen_notifications_count.dirty(user)
+
+
+@cache_wrapper(prefix="unc")
+def unseen_notifications_count(profile):
+    try:
+        return NotificationProfile.objects.get(user=profile).unread_count
+    except ObjectDoesNotExist:
+        return 0
diff --git a/judge/models/pagevote.py b/judge/models/pagevote.py
index 5e74c95..7accd01 100644
--- a/judge/models/pagevote.py
+++ b/judge/models/pagevote.py
@@ -5,6 +5,7 @@ from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 
 from judge.models.profile import Profile
+from judge.caching import cache_wrapper
 
 __all__ = ["PageVote", "PageVoteVoter"]
 
@@ -28,6 +29,7 @@ class PageVote(models.Model):
         ]
         unique_together = ("content_type", "object_id")
 
+    @cache_wrapper(prefix="PVvs")
     def vote_score(self, user):
         page_vote = PageVoteVoter.objects.filter(pagevote=self, voter=user)
         if page_vote.exists():
diff --git a/judge/models/profile.py b/judge/models/profile.py
index 96f3cfd..83bfc32 100644
--- a/judge/models/profile.py
+++ b/judge/models/profile.py
@@ -16,6 +16,7 @@ from sortedm2m.fields import SortedManyToManyField
 from judge.models.choices import ACE_THEMES, MATH_ENGINES_CHOICES, TIMEZONE
 from judge.models.runtime import Language
 from judge.ratings import rating_class
+from judge.caching import cache_wrapper
 
 
 __all__ = ["Organization", "Profile", "OrganizationRequest", "Friend"]
@@ -142,6 +143,7 @@ class Organization(models.Model):
         )
         verbose_name = _("organization")
         verbose_name_plural = _("organizations")
+        app_label = "judge"
 
 
 class Profile(models.Model):
@@ -266,10 +268,9 @@ class Profile(models.Model):
 
     @cached_property
     def count_unseen_notifications(self):
-        query = {
-            "read": False,
-        }
-        return self.notifications.filter(**query).count()
+        from judge.models.notification import unseen_notifications_count
+
+        return unseen_notifications_count(self)
 
     @cached_property
     def count_unread_chat_boxes(self):
diff --git a/judge/views/comment.py b/judge/views/comment.py
index 6965201..caa4eb6 100644
--- a/judge/views/comment.py
+++ b/judge/views/comment.py
@@ -27,7 +27,7 @@ from judge.dblock import LockModel
 from judge.models import Comment, CommentVote, Notification, BlogPost
 from judge.utils.views import TitleMixin
 from judge.widgets import MathJaxPagedownWidget, HeavyPreviewPageDownWidget
-from judge.comments import add_mention_notifications, del_mention_notifications
+from judge.comments import add_mention_notifications
 
 import json
 
@@ -240,7 +240,6 @@ class CommentEditAjax(LoginRequiredMixin, CommentMixin, UpdateView):
     def form_valid(self, form):
         # update notifications
         comment = form.instance
-        del_mention_notifications(comment)
         add_mention_notifications(comment)
 
         with transaction.atomic(), revisions.create_revision():
diff --git a/judge/views/notification.py b/judge/views/notification.py
index 63f38c2..bb79317 100644
--- a/judge/views/notification.py
+++ b/judge/views/notification.py
@@ -2,10 +2,9 @@ from django.contrib.auth.decorators import login_required
 from django.views.generic import ListView
 from django.utils.translation import ugettext as _
 from django.utils.timezone import now
-from django.db.models import BooleanField, Value
 
-from judge.utils.cachedict import CacheDict
-from judge.models import Profile, Comment, Notification
+from judge.models import Profile, Notification, NotificationProfile
+from judge.models.notification import unseen_notifications_count
 
 __all__ = ["NotificationList"]
 
@@ -16,24 +15,11 @@ class NotificationList(ListView):
     template_name = "notification/list.html"
 
     def get_queryset(self):
-        self.unseen_cnt = self.request.profile.count_unseen_notifications
+        self.unseen_cnt = unseen_notifications_count(self.request.profile)
 
-        query = {
-            "owner": self.request.profile,
-        }
-
-        self.queryset = (
-            Notification.objects.filter(**query)
-            .order_by("-time")[:100]
-            .annotate(seen=Value(True, output_field=BooleanField()))
-        )
-
-        # Mark the several first unseen
-        for cnt, q in enumerate(self.queryset):
-            if cnt < self.unseen_cnt:
-                q.seen = False
-            else:
-                break
+        self.queryset = Notification.objects.filter(
+            owner=self.request.profile
+        ).order_by("-id")[:100]
 
         return self.queryset
 
@@ -46,8 +32,6 @@ class NotificationList(ListView):
 
     def get(self, request, *args, **kwargs):
         ret = super().get(request, *args, **kwargs)
-
-        # update after rendering
-        Notification.objects.filter(owner=self.request.profile).update(read=True)
-
+        NotificationProfile.objects.filter(user=request.profile).update(unread_count=0)
+        unseen_notifications_count.dirty(self.request.profile)
         return ret
diff --git a/judge/views/organization.py b/judge/views/organization.py
index 0576afe..be80203 100644
--- a/judge/views/organization.py
+++ b/judge/views/organization.py
@@ -56,10 +56,10 @@ from judge.models import (
     Problem,
     Profile,
     Contest,
-    Notification,
     ContestProblem,
     OrganizationProfile,
 )
+from judge.models.notification import make_notification
 from judge import event_poster as event
 from judge.utils.ranker import ranker
 from judge.utils.views import (
@@ -1019,16 +1019,9 @@ class AddOrganizationBlog(
             html = (
                 f'<a href="{link}">{self.object.title} - {self.organization.name}</a>'
             )
-            for user in self.organization.admins.all():
-                if user.id == self.request.profile.id:
-                    continue
-                notification = Notification(
-                    owner=user,
-                    author=self.request.profile,
-                    category="Add blog",
-                    html_link=html,
-                )
-                notification.save()
+            make_notification(
+                self.organization.admins.all(), "Add blog", html, self.request.profile
+            )
             return res
 
 
@@ -1104,17 +1097,8 @@ class EditOrganizationBlog(
         )
         html = f'<a href="{link}">{blog.title} - {self.organization.name}</a>'
         post_authors = blog.authors.all()
-        posible_user = self.organization.admins.all() | post_authors
-        for user in posible_user:
-            if user.id == self.request.profile.id:
-                continue
-            notification = Notification(
-                owner=user,
-                author=self.request.profile,
-                category=action,
-                html_link=html,
-            )
-            notification.save()
+        posible_users = self.organization.admins.all() | post_authors
+        make_notification(posible_users, action, html, self.request.profile)
 
     def form_valid(self, form):
         with transaction.atomic(), revisions.create_revision():
diff --git a/judge/views/pagevote.py b/judge/views/pagevote.py
index 9ae6d5b..988d355 100644
--- a/judge/views/pagevote.py
+++ b/judge/views/pagevote.py
@@ -80,6 +80,7 @@ def vote_page(request, delta):
         else:
             PageVote.objects.filter(id=pagevote_id).update(score=F("score") + delta)
         break
+    _dirty_vote_score(pagevote_id, request.profile)
     return HttpResponse("success", content_type="text/plain")
 
 
@@ -103,3 +104,8 @@ class PageVoteDetailView(TemplateResponseMixin, SingleObjectMixin, View):
         context = super(PageVoteDetailView, self).get_context_data(**kwargs)
         context["pagevote"] = self.object.get_or_create_pagevote()
         return context
+
+
+def _dirty_vote_score(pagevote_id, profile):
+    pv = PageVote(id=pagevote_id)
+    pv.vote_score.dirty(pv, profile)
diff --git a/judge/views/ticket.py b/judge/views/ticket.py
index 3d62235..f4bf97a 100644
--- a/judge/views/ticket.py
+++ b/judge/views/ticket.py
@@ -49,16 +49,10 @@ ticket_widget = (
 
 def add_ticket_notifications(users, author, link, ticket):
     html = f'<a href="{link}">{ticket.linked_item}</a>'
-
     users = set(users)
     if author in users:
         users.remove(author)
-
-    for user in users:
-        notification = Notification(
-            owner=user, html_link=html, category="Ticket", author=author
-        )
-        notification.save()
+    make_notification(users, "Ticket", html, author)
 
 
 class TicketForm(forms.Form):
diff --git a/templates/notification/list.html b/templates/notification/list.html
index cd50e32..6aa7351 100644
--- a/templates/notification/list.html
+++ b/templates/notification/list.html
@@ -1,11 +1,8 @@
 {% extends "base.html" %}
 
 {% block body %}
-
   {% if not has_notifications %}
-
     <h2 style="text-align: center;">{{ _('You have no notifications') }}</h2>
-
   {% else %}
     <table class="table">
       <tr>
@@ -17,24 +14,15 @@
       {% for notification in notifications %}
         <tr class="{{ 'highlight' if not notification.seen }}">
           <td>
-            {% if notification.comment %}
-              {{ link_user(notification.comment.author) }}
-            {% else %}
-              {{ link_user(notification.author) }}
-            {% endif %}
-
+            {{ link_user(notification.author) }}
           </td>
           <td>
             {{ notification.category }}
           </td>
           <td>
-            {% if notification.comment %}
-              <a href="{{ notification.comment.link }}#comment-{{ notification.comment.id }}">{{ notification.comment.page_title }}</a>
-            {% else %}
-              {% autoescape off %}
-                {{notification.html_link}}
-              {% endautoescape %}
-            {% endif %}
+            {% autoescape off %}
+              {{notification.html_link}}
+            {% endautoescape %}
           </td>
           <td>
             {{ relative_time(notification.time) }}
@@ -43,8 +31,5 @@
       {% endfor %}
     </table>
   {% endif %}
-
 {% endblock %}
 
-<!--
-          -->
\ No newline at end of file