I’ve written about loading JavaScript asynchronously in the past, as it’s a great way to decrease load times and prevent hang-ups when third-party scripts don’t load properly. But Chris Coyier has went and compiled the definitive guide. It covers the basic concepts and reasons for doing it, as well as different methods for implementing it; the easy HTML5 way and using embedded scripts to inject a non-blocking call to an external script.
Its a nice long and informative article, and worth a look if you’re looking to do some performance optimization of web site. (Be sure to look into sprites after you’ve switched to loading JavaScript asynchronously!)
Thinking Async [CSS-Tricks]
