- IE7: 30
- FF3.0.1: 131
- Chrome Beta 1: 1279.6
Unlike Adobe's Tamarin engine, which is used in Flash and will appear in a future version of FireFox, V8 (see project page) does not rely on static typing to achieve its excellent performance. It dynamically figures out what data types you're actually using as the code executes and optimizes for those types. Conventional wisdom says that dynamic types are slower than dynamic, but the V8 team in Denmark has demonstrated that's not necessarily the case.
For more benchmark results see: