It's a couple years old but this is a pretty good explanation of the preloader - http://andydavies.me/blog/2013/10/22/how-the-browser-pre-loader-makes-pages-loa

It's a couple years old but this is a pretty good explanation of the preloader - http://andydavies.me/blog/2013/10/22/how-the-browser-pre-loader-makes-pages-load-faster/ http://andydavies.me/blog/2013/10/22/how-the-browser-pre-loa...