diff --git a/boards/models.py b/boards/models.py
--- a/boards/models.py
+++ b/boards/models.py
@@ -2,12 +2,14 @@ import os
 from random import random
 import time
 import math
+from django.core.cache import cache
 
 from django.db import models
 from django.db.models import Count
 from django.http import Http404
 from django.utils import timezone
 from markupfield.fields import MarkupField
+from boards import settings as board_settings
 
 from neboard import settings
 import thumbs
@@ -350,9 +352,17 @@ class User(models.Model):
         return RANK_MODERATOR >= self.rank
 
     def get_sorted_fav_tags(self):
+        cache_key = self._get_tag_cache_key()
+        fav_tags = cache.get(cache_key)
+        if fav_tags:
+            return fav_tags
+
         tags = self.fav_tags.annotate(Count('threads'))\
             .filter(threads__count__gt=0).order_by('name')
 
+        if tags:
+            cache.set(cache_key, tags, board_settings.CACHE_TIMEOUT)
+
         return tags
 
     def get_post_count(self):
@@ -366,6 +376,17 @@ class User(models.Model):
         if posts.count() > 0:
             return posts.latest('pub_time').pub_time
 
+    def add_tag(self, tag):
+        self.fav_tags.add(tag)
+        cache.delete(self._get_tag_cache_key())
+
+    def remove_tag(self, tag):
+        self.fav_tags.remove(tag)
+        cache.delete(self._get_tag_cache_key())
+
+    def _get_tag_cache_key(self):
+        return self.user_id + '_tags'
+
 
 class Setting(models.Model):
 
diff --git a/boards/settings.py b/boards/settings.py
new file mode 100644
--- /dev/null
+++ b/boards/settings.py
@@ -0,0 +1,1 @@
+CACHE_TIMEOUT = 600 # Timeout for caching, if cache is used
\ No newline at end of file
diff --git a/boards/views.py b/boards/views.py
--- a/boards/views.py
+++ b/boards/views.py
@@ -338,7 +338,7 @@ def tag_subscribe(request, tag_name):
     tag = get_object_or_404(Tag, name=tag_name)
 
     if not tag in user.fav_tags.all():
-        user.fav_tags.add(tag)
+        user.add_tag(tag)
 
     return _redirect_to_next(request)
 
@@ -350,7 +350,7 @@ def tag_unsubscribe(request, tag_name):
     tag = get_object_or_404(Tag, name=tag_name)
 
     if tag in user.fav_tags.all():
-        user.fav_tags.remove(tag)
+        user.remove_tag(tag)
 
     return _redirect_to_next(request)