Know Your Engines: How to make JavaScript Fast
David Mandelin manages the JavaScript engine team and Mozilla, and is also the module owner of SpiderMonkey, Firefox’s JavaScript engine. So, it stands to reason he knows a thing or two about how to make JavaScript faster. Embedded below is his talk from Oreilly’s Velocity conference explaining how modern JavaScript engines work and how to take advantage of their performance enhancements.
[Via http://www.html5gamedevs.com/2012/02/07/engines-javascript-fast/]