Hash#except is expensive and this is a hotspot, so use a dup + delete

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -657,7 +657,8 @@ def url_for(options)
           script_name = original_script_name + script_name
         end
 
-        path_options = options.except(*RESERVED_OPTIONS)
+        path_options = options.dup
+        RESERVED_OPTIONS.each { |ro| path_options.delete ro }
         path_options = yield(path_options) if block_given?
 
         path, params = generate(path_options, recall || {})