diff --git a/boards/models.py b/boards/models.py
--- a/boards/models.py
+++ b/boards/models.py
@@ -64,6 +64,10 @@ class PostManager(models.Manager):
             thread.bump()
             thread.last_edit_time = timezone.now()
             thread.save()
+
+            cache_key = thread.get_cache_key
+            cache.delete(cache_key)
+
         else:
             self._delete_old_threads()
 
@@ -81,6 +85,9 @@ class PostManager(models.Manager):
             thread.last_edit_time = timezone.now()
             thread.save()
 
+            cache_key = thread.get_cache_key
+            cache.delete(cache_key)
+
         post.delete()
 
     def delete_posts_by_ip(self, ip):
@@ -116,10 +123,17 @@ class PostManager(models.Manager):
         except Post.DoesNotExist:
             raise Http404
 
+        cache_key = opening_post.get_cache_key()
+        thread = cache.get(cache_key)
+        if thread:
+            return thread
+
         if opening_post.replies:
             thread = [opening_post]
             thread.extend(opening_post.replies.all().order_by('pub_time'))
 
+            cache.set(cache_key, thread, board_settings.CACHE_TIMEOUT)
+
             return thread
 
     def exists(self, post_id):
@@ -303,6 +317,7 @@ class Post(models.Model):
         if self.can_bump():
             self.bump_time = timezone.now()
 
+
     def get_last_replies(self):
         if settings.LAST_REPLIES_COUNT > 0:
             reply_count = self.get_reply_count()
@@ -320,6 +335,9 @@ class Post(models.Model):
 
         return self.tags.order_by('name')
 
+    def get_cache_key(self):
+        return str(self.id) + str(self.last_edit_time)
+
 
 class User(models.Model):