Say bye to SpiderMonkey…
And welome TraceMonkey - new Mozilla JavaScript engine.
It will be introduced in Firefox 3.1.
It will bring near to native performance for the heart of Web 2.0 - JavaScript.
In tests published in mozilla blogs (Brendan’s blog) it is clear that it will be lighting fast in comparison to FF 3.
Actual numbers vary from 2 to 37 times faster.