So, I just downloaded the new Opera, and ran a JavaScript speed check, and was amazed how their new engines compare to the other browsers around. It also supports Windows 7 taskbar highlights properly
The test I ran was on http://www2.webkit.org/perf/sunspider-0.9/sunspider-driver.html and here are the results
Opera 10.50
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RESULTS (means and 95% confidence intervals)
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Total: 388.6ms +/- 2.3%
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Chrome 4.0.249
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RESULTS (means and 95% confidence intervals)
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Total: 556.2ms +/- 3.1%
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Firefox 3.5.8
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RESULTS (means and 95% confidence intervals)
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Total: 1155.4ms +/- 1.6%
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Internet Explorer 8
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RESULTS (means and 95% confidence intervals)
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Total: 5145.4ms +/- 0.6%
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Safari
RESULTS (means and 95% confidence intervals)
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Total: 298.2ms +/- 6.5%
POW POW