From the Faster Pussycat dept.:
...reviewers loaded Firefox 3.1 beta on a Vista desktop outfitted with 2 GB RAM and Pentium dual-core at 1.80 GHz. Take a look at these benchmark numbers from a side-by-side comparison of IE7 and Firefox 3.1 running on the same box:

-- 3D Java rendering test : IE: 2.85 seconds, Firefox: 0.857 seconds

-- SunSpider java benchmark tests: IE: 107159.4ms, Firefox: 3894.6ms

-- Acid 3 : IE: 12/100, Firefox: 89/100

crn.com