Great test. I don't have IE9 (since I need IE8 for testing, and MS still hasn't figured out how/conjured the will to make IE work like a normal application), but it's interesting to compare FF4 and Chrome. The performance looked about equivalent between the 2. Neither reports a framerate, so not sure about the exact numbers.
Just a FYI - You can uninstall IE9 from your computer. It's not listed in the Add/Remove Programs list but you can find it under the "Installed Updates" list.
And everything truly reverts to the same as it was before, Vista with IE7 upgraded to IE8? I'm (understandably in my opinion) a bit wary. I need to test websites on a normal installation of IE8. IE often has odd little details that make one machine act different from another once you start changing things.
