http://julian.com/research/velocity/
http://julian.com/research/velocity/demo.html
http://zencode.in/19.CSS-vs-JS%E5%8A%A8%E7%94%BB%EF%BC%9A%E8%B0%81%E6%9B%B4%E5%BF%AB%EF%BC%9F.html
http://www.devoxx.com/display/DV12/Faster+Websites++Crash+Course+on+Frontend+Performance