diff --git a/boards/models/tag.py b/boards/models/tag.py
--- a/boards/models/tag.py
+++ b/boards/models/tag.py
@@ -4,6 +4,7 @@ from django.db.models import Count
 from django.core.urlresolvers import reverse
 
 from boards.models.base import Viewable
+from boards.utils import cached_result
 
 
 __author__ = 'neko259'
@@ -70,5 +71,6 @@ class Tag(models.Model, Viewable):
             'tag': self,
         })
 
+    @cached_result
     def get_post_count(self):
         return self.get_threads().aggregate(num_posts=Count('post'))['num_posts']