> especially because my system is high-end (Quad core 2.66Ghz, 3MB
> cache, 4GB DDR3 RAM with Vista 6bit) and 4the MOZdev team boasts FF4b
> to be fast.
You seem to think that "fast" is a one-dimensional absolute metric.
The Fx4 betas are generally much faster than Fx 3.6.
On some tasks, the Fx4 betas are much faster than Opera or Chrome.
On some tasks, the Fx4 betas are much slower than Opera or Chrome.
And in fact, the same will probably be true for the final release. Some
things will be faster; some will be slower. It's up to you whether the
things that matter to you personally are performance of web apps or
execution time of a buggy benchmark that has code that's specifically
designed to make some browsers run slower by executing different tasks
in different browsers.