diff --git a/addons/website_forum/models/forum.py b/addons/website_forum/models/forum.py
index 5bcd91739cd..76fe2e403de 100644
--- a/addons/website_forum/models/forum.py
+++ b/addons/website_forum/models/forum.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from datetime import datetime
+import itertools
 import logging
 import math
 import re
@@ -9,6 +10,7 @@ from werkzeug.exceptions import Forbidden
 
 from openerp import _
 from openerp import api, fields, models
+from openerp import http
 from openerp import modules
 from openerp import tools
 from openerp import SUPERUSER_ID
@@ -289,31 +291,32 @@ class Post(models.Model):
     can_comment_convert = fields.Boolean('Can Convert to Comment', compute='_get_post_karma_rights')
     can_view = fields.Boolean('Can View', compute='_get_post_karma_rights')
 
-    @api.one
+    @api.multi
     def _get_post_karma_rights(self):
         user = self.env.user
-        post = self.sudo()
+        # sudoed recordset instead of individual posts so values can be
+        # prefetched in bulk
+        for post, post_sudo in itertools.izip(self, self.sudo()):
+            is_creator = post.create_uid == user
 
-        is_creator = post.create_uid.id == self._uid
+            post.karma_accept = post.forum_id.karma_answer_accept_own if post.parent_id.create_uid == user else post.forum_id.karma_answer_accept_all
+            post.karma_edit = post.forum_id.karma_edit_own if is_creator else post.forum_id.karma_edit_all
+            post.karma_close = post.forum_id.karma_close_own if is_creator else post.forum_id.karma_close_all
+            post.karma_unlink = post.forum_id.karma_unlink_own if is_creator else post.forum_id.karma_unlink_all
+            post.karma_comment = post.forum_id.karma_comment_own if is_creator else post.forum_id.karma_comment_all
+            post.karma_comment_convert = post.forum_id.karma_comment_convert_own if is_creator else post.forum_id.karma_comment_convert_all
 
-        self.karma_accept = self.forum_id.karma_answer_accept_own if post.parent_id and post.parent_id.create_uid.id == self._uid else self.forum_id.karma_answer_accept_all
-        self.karma_edit = self.forum_id.karma_edit_own if is_creator else self.forum_id.karma_edit_all
-        self.karma_close = self.forum_id.karma_close_own if is_creator else self.forum_id.karma_close_all
-        self.karma_unlink = self.forum_id.karma_unlink_own if is_creator else self.forum_id.karma_unlink_all
-        self.karma_comment = self.forum_id.karma_comment_own if is_creator else self.forum_id.karma_comment_all
-        self.karma_comment_convert = self.forum_id.karma_comment_convert_own if is_creator else self.forum_id.karma_comment_convert_all
-
-        self.can_ask = user.karma >= self.forum_id.karma_ask
-        self.can_answer = user.karma >= self.forum_id.karma_answer
-        self.can_accept = user.karma >= self.karma_accept
-        self.can_edit = user.karma >= self.karma_edit
-        self.can_close = user.karma >= self.karma_close
-        self.can_unlink = user.karma >= self.karma_unlink
-        self.can_upvote = user.karma >= self.forum_id.karma_upvote
-        self.can_downvote = user.karma >= self.forum_id.karma_downvote
-        self.can_comment = user.karma >= self.karma_comment
-        self.can_comment_convert = user.karma >= self.karma_comment_convert
-        self.can_view = user.karma >= self.karma_close or post.create_uid.karma > 0
+            post.can_ask = user.karma >= post.forum_id.karma_ask
+            post.can_answer = user.karma >= post.forum_id.karma_answer
+            post.can_accept = user.karma >= post.karma_accept
+            post.can_edit = user.karma >= post.karma_edit
+            post.can_close = user.karma >= post.karma_close
+            post.can_unlink = user.karma >= post.karma_unlink
+            post.can_upvote = user.karma >= post.forum_id.karma_upvote
+            post.can_downvote = user.karma >= post.forum_id.karma_downvote
+            post.can_comment = user.karma >= post.karma_comment
+            post.can_comment_convert = user.karma >= post.karma_comment_convert
+            post.can_view = user.karma >= post.karma_close or post_sudo.create_uid.karma > 0
 
     @api.one
     @api.constrains('post_type', 'forum_id')
diff --git a/addons/website_forum/views/website_forum.xml b/addons/website_forum/views/website_forum.xml
index 40a4ef58623..a78f966af7f 100644
--- a/addons/website_forum/views/website_forum.xml
+++ b/addons/website_forum/views/website_forum.xml
@@ -561,14 +561,20 @@
 </template>
 
 <template id="vote">
+    <t t-set="own_vote" t-value="post.user_vote"/>
+    <t t-set="forum" t-value="post.forum_id"/>
+    <t t-set="karma_up" t-value="forum.karma_upvote"/>
+    <t t-set="karma_down" t-value="forum.karma_downvote"/>
+    <t t-set="can_upvote" t-value="post.can_upvote"/>
+    <t t-set="can_downvote" t-value="post.can_downvote"/>
     <div class="vote text-center">
-        <a t-attf-class="vote_up fa fa-caret-up no-decoration #{post.user_vote == 1 and 'text-success' or ''} #{((post.user_vote == 1 and not post.can_downvote) or not post.can_upvote) and 'karma_required' or ''}"
-            t-attf-data-karma="#{post.user_vote == 1 and post.forum_id.karma_downvote or post.forum_id.karma_upvote}"
-            t-attf-data-href="/forum/#{slug(post.forum_id)}/post/#{slug(post)}/upvote"/>
+        <a t-attf-class="vote_up fa fa-caret-up no-decoration #{own_vote == 1 and 'text-success' or ''} #{((own_vote == 1 and not can_downvote) or not can_upvote) and 'karma_required' or ''}"
+            t-attf-data-karma="#{own_vote == 1 and karma_down or karma_up}"
+            t-attf-data-href="/forum/#{slug(forum)}/post/#{slug(post)}/upvote"/>
         <div class="vote_count text-muted" t-esc="post.vote_count"/>
-        <a t-attf-class="vote_down fa fa-caret-down no-decoration #{post.user_vote == -1 and 'text-warning' or ''} #{((post.user_vote == -1 and not post.can_upvote) or not post.can_downvote) and 'karma_required' or ''}"
-            t-attf-data-karma="#{post.user_vote == -1 and post.forum_id.karma_upvote or post.forum_id.karma_downvote}"
-            t-attf-data-href="/forum/#{slug(post.forum_id)}/post/#{slug(post)}/downvote"/>
+        <a t-attf-class="vote_down fa fa-caret-down no-decoration #{own_vote == -1 and 'text-warning' or ''} #{((own_vote == -1 and not can_upvote) or not can_downvote) and 'karma_required' or ''}"
+            t-attf-data-karma="#{own_vote == -1 and karma_up or karma_down}"
+            t-attf-data-href="/forum/#{slug(forum)}/post/#{slug(post)}/downvote"/>
         <t t-raw="0"/>
     </div>
 </template>