diff --git a/app/jobs/regular/pull_hotlinked_images.rb b/app/jobs/regular/pull_hotlinked_images.rb
index 3ff3060acad..d3b7889d63a 100644
--- a/app/jobs/regular/pull_hotlinked_images.rb
+++ b/app/jobs/regular/pull_hotlinked_images.rb
@@ -74,7 +74,6 @@ module Jobs
         options[:bypass_bump] = true if args[:bypass_bump] == true
         post.revise(Discourse.system_user, raw, options)
       end
-
     end
 
     def extract_images_from(html)
diff --git a/lib/cooked_post_processor.rb b/lib/cooked_post_processor.rb
index 7a691943936..9659a83b79f 100644
--- a/lib/cooked_post_processor.rb
+++ b/lib/cooked_post_processor.rb
@@ -12,6 +12,7 @@ class CookedPostProcessor
     @dirty = false
     @opts = opts
     @post = post
+    @previous_cooked = (@post.cooked || "").dup
     @doc = Nokogiri::HTML::fragment(post.cooked)
     @size_cache = {}
   end
@@ -58,7 +59,6 @@ class CookedPostProcessor
       src, width, height = img["src"], img["width"], img["height"]
       limit_size!(img)
       convert_to_link!(img)
-      @dirty |= (src != img["src"]) || (width.to_i != img["width"].to_i) || (height.to_i != img["height"].to_i)
     end
 
     update_topic_image(images)
@@ -130,8 +130,6 @@ class CookedPostProcessor
     end
 
     add_lightbox!(img, original_width, original_height, upload)
-
-    @dirty = true
   end
 
   def is_a_hyperlink?(img)
@@ -207,8 +205,6 @@ class CookedPostProcessor
     result = Oneboxer.apply(@doc) do |url, element|
       Oneboxer.onebox(url, args)
     end
-
-    @dirty |= result.changed?
   end
 
   def optimize_urls
@@ -251,7 +247,7 @@ class CookedPostProcessor
   end
 
   def dirty?
-    @dirty
+    @previous_cooked != html
   end
 
   def html
diff --git a/lib/url_helper.rb b/lib/url_helper.rb
index 8e46e00ee6e..33f1b6ed4f4 100644
--- a/lib/url_helper.rb
+++ b/lib/url_helper.rb
@@ -1,7 +1,9 @@
 module UrlHelper
 
   def is_local(url)
-    Discourse.store.has_been_uploaded?(url) || url =~ /^\/assets\//
+    Discourse.store.has_been_uploaded?(url) ||
+    url =~ /^\/assets\// ||
+    url.start_with?(Discourse.asset_host || Discourse.base_url_no_prefix)
   end
 
   def absolute(url)