diff --git a/lib/migrate.js b/lib/migrate.js
index <HASH>..<HASH> 100644
--- a/lib/migrate.js
+++ b/lib/migrate.js
@@ -5,7 +5,7 @@ var loader = require('./loader')
 
 var level1props = ['amd', 'bail', 'cache', 'context', 'dependencies',
   'devServer', 'devtool', 'entry', 'externals', 'loader', 'module', 'name',
-  'node', 'output', 'plugins', 'profile', 'recordsInputPath',
+  'node', 'output', 'performance', 'plugins', 'profile', 'recordsInputPath',
   'recordsOutputPath', 'recordsPath', 'resolve', 'resolveLoader', 'stats',
   'target', 'watch', 'watchOptions']
compatible webpack beta <I>