diff --git a/app/models/post.rb b/app/models/post.rb
index 7279a0ff271..ff6c32890b4 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -516,13 +516,32 @@ class Post < ActiveRecord::Base
   end
 
   def self.rebake_old(limit)
+
+    limiter = RateLimiter.new(
+      nil,
+      "global_periodical_rebake_limit",
+      GlobalSetting.max_old_rebakes_per_15_minutes,
+      900,
+      global: true
+    )
+
     problems = []
     Post.where('baked_version IS NULL OR baked_version < ?', BAKED_VERSION)
       .order('id desc')
       .limit(limit).pluck(:id).each do |id|
       begin
+
+        break if !limiter.can_perform?
+
         post = Post.find(id)
         post.rebake!
+
+        begin
+          limiter.performed!
+        rescue RateLimiter::LimitExceeded
+          break
+        end
+
       rescue => e
         problems << { post: post, ex: e }
 
diff --git a/config/discourse_defaults.conf b/config/discourse_defaults.conf
index 43ce40ba2d9..cde2c3666d1 100644
--- a/config/discourse_defaults.conf
+++ b/config/discourse_defaults.conf
@@ -202,3 +202,8 @@ force_anonymous_min_queue_seconds = 1
 # only trigger anon if we see more than N requests for this path in last 10 seconds
 force_anonymous_min_per_10_seconds = 3
 
+# maximum number of posts rebaked across the cluster in the periodical job
+# rebake process is very expensive, on multisite we have to make sure we never
+# flood the queue
+max_old_rebakes_per_15_minutes = 300
+
diff --git a/config/site_settings.yml b/config/site_settings.yml
index ebfd493e877..afaa044a15b 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -1411,7 +1411,7 @@ developer:
   top_topics_formula_least_likes_per_post_multiplier:
     default: 3
   rebake_old_posts_count:
-    default: 100
+    default: 80
     min: 1
   migrate_to_new_scheme:
     hidden: true
diff --git a/spec/models/post_spec.rb b/spec/models/post_spec.rb
index dce839102db..9ddfccfb3fd 100644
--- a/spec/models/post_spec.rb
+++ b/spec/models/post_spec.rb
@@ -1153,6 +1153,27 @@ describe Post do
       post.reload
       expect(post.baked_at).to eq(baked)
     end
+
+    it "will rate limit globally" do
+
+      post1 = create_post
+      post2 = create_post
+      post3 = create_post
+
+      Post.where(id: [post1.id, post2.id, post3.id]).update_all(baked_version: -1)
+
+      global_setting :max_old_rebakes_per_15_minutes, 2
+
+      RateLimiter.clear_all_global!
+      RateLimiter.enable
+
+      Post.rebake_old(100)
+
+      expect(post3.reload.baked_version).not_to eq(-1)
+      expect(post2.reload.baked_version).not_to eq(-1)
+      expect(post1.reload.baked_version).to eq(-1)
+
+    end
   end
 
   describe ".unhide!" do