Box2D as a Measure of Runtime PerformanceFor those unfamiliar with it, Box2D is a great 2D physics library written by Erin Catto, which is at the core of a large number of casual games on consoles and mobile devices. Angry Birds is one you might have heard of, but there are many, many others. It's also not a simple library by any means. When porting Angry Birds to HTML5, we found that in some cases Box2D performance could be the limiting
