Basically to change this... - Request index.html - Parse index.html - Request .js and .css and .jpg/png, etc found inside - Parse .js and .css found inside

Basically to change this... - Request index.html - Parse index.html - Request .js and .css and .jpg/png, etc found inside - Parse .js and .css found inside - Request additional .js, .css and .jpg/png, etc found within js/css - Parse.... Into this... - Request index.html, .css, .js, *.jpg/png - Parse all To avoid multiple round trips and improve initial page load time if you "know" what's going to be requested from the beginning.