* [http://www.html5rocks.com/en/features/performance](http://www.html5rocks.com/en/features/performance) * [http://developer.yahoo.com/performance/rules.html](http://developer.yahoo.com/performance/rules.html) * [http://code.google.com/speed/page-speed/docs/rules_intro.html](http://code.google.com/speed/page-speed/docs/rules_intro.html) * [http://code.google.com/speed/index.html](http://code.google.com/speed/index.html)