..

config/environments/production.rb

@@ -3,8 +3,7 @@ Rails.application.configure do
 
   # Code is not reloaded between requests.
   config.cache_classes = true
-  config.serve_static_assets = true
-  config.assets.compile = true
+  config.autoload_paths << Rails.root.join('assets/images')
   # Eager load code on boot. This eager loads most of Rails and
   # your application in memory, allowing both threaded web servers
   # and those relying on copy on write to perform better.