You're only using Windows 7 SP1 as your test platform. Just because Chrome gets the fastest scores on that particular platform doesn't automatically imply that the browser is fastest on every OS platform. In my case, I use Ubuntu 11.04 as my main OS and on this machine, a 3GHz AMD dual core, Chrome comes in dead last on SunSpider....as usual.
The SunSpider tests I did just now gave this result -
Firefox 7 - 259.0ms +/- 1.4%
Opera 11.51 - 296.1ms +/- 1.1%
Chrome 14 - 336.2ms +/- 1.7%
SunSpider is the only test I pay any attention to because it's the only one whose findings correlate with my daily browsing experience. None of those other tests actually measures the things that matter the most to everyday people when it comes to using a browser.
For instance, none of them will tell you that Firefox renders pages more reliably than Chrome does. If you open 40 pages in Chrome and the same 40 pages in Firefox, Firefox will render each and every page perfectly every time, while Chrome might not, causing you to have to refresh a few tabs. I've also found that Firefox loads pictures in web pages noticeably faster than Chrome does. These things matter more to my browsing experience than which browser has new HTML5 features that may or may not ever reach the final draft of HTML5.
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