A special nightly build of Firefox 3.0 has been released that greatly improves JavaScript performance. The build was run against the SunSpider JavaScript Benchmark, and the results are really surprising. From the article:
- Firefox 3 Nightly (PGO Optimized): 7263.8ms
- Firefox 3 Nightly (02/25/2008 build): 8219.4ms
- Opera 9.5.9807 Beta: 10824.0ms
- Firefox 3 Beta 3: 16080.6ms
- Safari 3.0.4 Beta: 18012.6ms
- Firefox 2.0.0.12: 29376.4ms
- Internet Explorer 7: 72375.0ms
This optimized build is nearly 4 times faster than the current release of Firefox, and 10 times faster than IE 7; pretty cool!
I have yet to switch to Firefox 3, mostly because lots of my favorite extensions don't yet work (including the ones I've written). There are a handful of changes that have to be made in order for extensions to work in the new environment, some of which aren't exactly trivial. As we get closer to an actual release, I'll do my best to update my extensions.