Mobile Safari Cache 성능, History Back Control

http://www.stevesouders.com/blog/2011/06/28/lack-of-caching-for-iphone-home-screen-apps/
http://www.stevesouders.com/blog/2011/06/27/unexpected-reloads-in-webkit/

history back을 이용하여 reload를 최소한으로 줄여야 한다.