diff --git a/dmoj/decorators.py b/dmoj/decorators.py
new file mode 100644
index 0000000..b6c6d0d
--- /dev/null
+++ b/dmoj/decorators.py
@@ -0,0 +1,12 @@
+import time
+
+def timeit(method):
+    def timed(*args, **kw):
+        ts = time.time()
+        result = method(*args, **kw)
+        te = time.time()
+        if 'log_time' in kw:
+            name = kw.get('log_name', method.__name__.upper())
+            kw['log_time'][name] = int((te - ts) * 1000)
+        return result
+    return timed
\ No newline at end of file
diff --git a/judge/ml/collab_filter.py b/judge/ml/collab_filter.py
index 511cebc..2a8171f 100644
--- a/judge/ml/collab_filter.py
+++ b/judge/ml/collab_filter.py
@@ -1,6 +1,7 @@
 import numpy as np
 from django.conf import settings
 import os
+from dmoj.decorators import timeit
 
 
 class CollabFilter:
@@ -8,7 +9,8 @@ class CollabFilter:
     COSINE = 'cosine'
 
     # name = 'collab_filter' or 'collab_filter_time'
-    def __init__(self, name):
+    @timeit
+    def __init__(self, name, **kwargs):
         embeddings = np.load(os.path.join(settings.ML_OUTPUT_PATH, name + '/embeddings.npz'),
             allow_pickle=True)
         arr0, arr1 = embeddings.files
@@ -34,7 +36,8 @@ class CollabFilter:
         scores = u.dot(V.T)
         return scores
 
-    def user_recommendations(self, user, problems, measure=DOT, limit=None):
+    @timeit
+    def user_recommendations(self, user, problems, measure=DOT, limit=None, **kwargs):
         uid = user.id
         if uid >= len(self.user_embeddings):
             uid = 0
diff --git a/judge/views/problem.py b/judge/views/problem.py
index ddb83c5..5d7e331 100644
--- a/judge/views/problem.py
+++ b/judge/views/problem.py
@@ -591,6 +591,8 @@ class ProblemList(QueryStringSortMixin, TitleMixin, SolvedProblemMixin, ListView
         return HttpResponseRedirect(request.get_full_path())
 
 
+cf_logger = logging.getLogger('judge.ml.collab_filter')
+
 class ProblemFeed(ProblemList):
     model = Problem
     context_object_name = 'problems'
@@ -645,20 +647,39 @@ class ProblemFeed(ProblemList):
         if not settings.ML_OUTPUT_PATH or not user:
             return queryset.order_by('?')
         
-        cf_model = CollabFilter('collab_filter')
-        cf_time_model = CollabFilter('collab_filter_time')
+        # Logging
+        log_data = {
+            'user': self.request.user.username,
+            'cf': {
+                'dot': {},
+                'cosine': {},
+            },
+            'cf_time': {
+                'dot': {},
+                'cosine': {}
+            },
+        }
+
+        cf_model = CollabFilter('collab_filter', log_time=log_data['cf'])
+        cf_time_model = CollabFilter('collab_filter_time', log_time=log_data['cf_time'])
         hot_problems_recommendations = [
             problem for problem in hot_problems(timedelta(days=7), 20)
                     if problem in queryset
         ]
 
         q = self.merge_recommendation([
-            cf_model.user_recommendations(user, queryset, cf_model.DOT, 100),
-            cf_model.user_recommendations(user, queryset, cf_model.COSINE, 100),
-            cf_time_model.user_recommendations(user, queryset, cf_time_model.COSINE, 100),
-            cf_time_model.user_recommendations(user, queryset, cf_time_model.DOT, 100),
+            cf_model.user_recommendations(user, queryset, cf_model.DOT, 100, 
+                        log_time=log_data['cf']['dot']),
+            cf_model.user_recommendations(user, queryset, cf_model.COSINE, 100,
+                        log_time=log_data['cf']['cosine']),
+            cf_time_model.user_recommendations(user, queryset, cf_time_model.COSINE, 100,
+                        log_time=log_data['cf_time']['cosine']),
+            cf_time_model.user_recommendations(user, queryset, cf_time_model.DOT, 100,
+                        log_time=log_data['cf_time']['dot']),
             hot_problems_recommendations
         ])
+
+        cf_logger.info(log_data)
         return q
 
     def get_context_data(self, **kwargs):