diff --git a/actionpack/lib/action_view/template.rb b/actionpack/lib/action_view/template.rb
index c00557209b..40ff1f2182 100644
--- a/actionpack/lib/action_view/template.rb
+++ b/actionpack/lib/action_view/template.rb
@@ -156,11 +156,12 @@ def counter_name
     end
 
     def inspect
-      if defined?(Rails.root)
-        identifier.sub("#{Rails.root}/", '')
-      else
-        identifier
-      end
+      @inspect ||=
+        if defined?(Rails.root)
+          identifier.sub("#{Rails.root}/", '')
+        else
+          identifier
+        end
     end
 
     private
@@ -267,9 +268,11 @@ def #{method_name}(local_assigns)
       end
 
       def build_method_name(locals)
-        # TODO: is locals.keys.hash reliably the same?
-        @method_names[locals.keys.hash] ||=
-          "_render_template_#{@identifier.hash}_#{__id__}_#{locals.keys.hash}".gsub('-', "_")
+        @method_names[locals.keys.hash] ||= "_#{identifier_method_name}__#{@identifier.hash}_#{__id__}_#{locals.keys.hash}".gsub('-', "_")
+      end
+
+      def identifier_method_name
+        @identifier_method_name ||= inspect.gsub(/[^a-z_]/, '_')
       end
   end
 end