diff --git a/addons/website_blog/controllers/main.py b/addons/website_blog/controllers/main.py
index e4990b7413f..c013644c677 100644
--- a/addons/website_blog/controllers/main.py
+++ b/addons/website_blog/controllers/main.py
@@ -22,12 +22,12 @@ class WebsiteBlog(http.Controller):
     _post_comment_per_page = 10
 
     def tags_list(self, tag_ids, current_tag):
-        tag_ids = list(tag_ids) # required to avoid using the same list
+        tag_ids = list(tag_ids)  # required to avoid using the same list
         if current_tag in tag_ids:
             tag_ids.remove(current_tag)
         else:
             tag_ids.append(current_tag)
-        tag_ids = request.env['blog.tag'].browse(tag_ids).exists()
+        tag_ids = request.env['blog.tag'].browse(tag_ids)
         return ','.join(slug(tag) for tag in tag_ids)
 
     def nav_list(self, blog=None):
@@ -57,6 +57,7 @@ class WebsiteBlog(http.Controller):
     def _prepare_blog_values(self, blogs, blog=False, date_begin=False, date_end=False, tags=False, state=False, page=False):
         """ Prepare all values to display the blogs index page or one specific blog"""
         BlogPost = request.env['blog.post']
+        BlogTag = request.env['blog.tag']
 
         # prepare domain
         domain = request.website.website_domain()
@@ -66,15 +67,16 @@ class WebsiteBlog(http.Controller):
 
         if date_begin and date_end:
             domain += [("post_date", ">=", date_begin), ("post_date", "<=", date_end)]
-
         active_tag_ids = tags and [unslug(tag)[1] for tag in tags.split(',')] or []
+        active_tags = BlogTag
         if active_tag_ids:
-            fixed_tag_slug = ",".join(slug(t) for t in request.env['blog.tag'].browse(active_tag_ids).exists())
+            active_tags = BlogTag.browse(active_tag_ids).exists()
+            fixed_tag_slug = ",".join(slug(t) for t in active_tags)
             if fixed_tag_slug != tags:
                 new_url = request.httprequest.full_path.replace("/tag/%s" % tags, "/tag/%s" % fixed_tag_slug, 1)
                 if new_url != request.httprequest.full_path:  # check that really replaced and avoid loop
                     return request.redirect(new_url, 301)
-            domain += [('tag_ids', 'in', active_tag_ids)]
+            domain += [('tag_ids', 'in', active_tags.ids)]
 
         if request.env.user.has_group('website.group_website_designer'):
             count_domain = domain + [("website_published", "=", True), ("post_date", "<=", fields.Datetime.now())]
@@ -127,7 +129,7 @@ class WebsiteBlog(http.Controller):
             'pager': pager,
             'posts': posts.with_prefetch(post_ids),
             'tag': tags,
-            'active_tag_ids': active_tag_ids,
+            'active_tag_ids': active_tags.ids,
             'domain': domain,
             'state_info': state and {"state": state, "published": published_count, "unpublished": unpublished_count},
             'blogs': blogs,
diff --git a/addons/website_blog/tests/test_performance.py b/addons/website_blog/tests/test_performance.py
index 25a29b5e479..456404d1ad0 100644
--- a/addons/website_blog/tests/test_performance.py
+++ b/addons/website_blog/tests/test_performance.py
@@ -2,11 +2,12 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo.addons.website.tests.test_performance import UtilPerf
+import random
 
 
 class TestBlogPerformance(UtilPerf):
     def test_10_perf_sql_blog_standard_data(self):
-        self.assertEqual(self._get_url_hot_query('/blog'), 50)
+        self.assertEqual(self._get_url_hot_query('/blog'), 40)
 
     def test_20_perf_sql_blog_bigger_data_scaling(self):
         BlogPost = self.env['blog.post']
@@ -18,4 +19,19 @@ class TestBlogPerformance(UtilPerf):
         for blog_post in blog_posts:
             blog_post.tag_ids += blog_tags
             blog_tags = blog_tags[:-1]
-        self.assertEqual(self._get_url_hot_query('/blog'), 116)
+        self.assertEqual(self._get_url_hot_query('/blog'), 38)
+
+        self.assertEqual(self._get_url_hot_query(blog_post[0].website_url), 61)
+
+    def test_30_perf_sql_blog_bigger_data_random(self):
+        BlogPost = self.env['blog.post']
+        BlogTag = self.env['blog.tag']
+        blogs = self.env['blog.blog'].search([])
+        blog_tags = BlogTag.create([{'name': 'New Blog Tag Test %s' % i} for i in range(1, 50)])
+        BlogPost.create([{'name': 'New Blog Post Test %s' % i, 'is_published': True, 'blog_id': blogs[random.randint(0, 1)].id} for i in range(1, 100)])
+        blog_posts = BlogPost.search([])
+        for blog_post in blog_posts:
+            blog_post.write({'tag_ids': [[6, 0, random.choices(blog_tags.ids, k=random.randint(0, len(blog_tags)))]]})
+        self.assertEqual(self._get_url_hot_query('/blog'), 38)
+
+        self.assertEqual(self._get_url_hot_query(blog_post[0].website_url), 61)