Make collection rendering faster.

actionpack/lib/abstract_controller/rendering.rb

@@ -50,7 +50,7 @@ def view_context_class
             if controller.respond_to?(:_helpers)
               include controller._helpers
 
-              if controller.respond_to?(:_routes)
+              if controller.respond_to?(:_routes) && controller._routes
                 include controller._routes.url_helpers
                 include controller._routes.mounted_helpers
               end

actionpack/lib/action_view/render/partials.rb

@@ -307,12 +307,12 @@ def collection_with_template
 
       def collection_without_template
         segments, locals, collection_data = [], @locals, @collection_data
-        index, template  = -1, nil
+        index, template, cache = -1, nil, {}
         keys = @locals.keys
 
         @collection.each_with_index do |object, i|
           path, *data = collection_data[i]
-          template = find_template(path, keys + data)
+          template = (cache[path] ||= find_template(path, keys + data))
           locals[data[0]] = object
           locals[data[1]] = (index += 1)
           segments << template.render(@view, locals)