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Running latest version of Chrome on Windows 7 here and seeing the same things. Nothing is overly much faster and in some instances, like you noticed selecting a class is slower in 1.8 compared to 1.7.2. A little worrying, but I'm sure there's an explanation.

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I'm running Chrome on Win7 and I'm seeing approx 80-90% faster for the id test, but no real difference in any other test.

I'm seeing the same but because ID selection is already 2 orders of magnitude faster than any other type, the net win here is significantly reduced. The rich are just getting richer.

"the net win here is significantly reduced"

Do you mind illustrating how the net performance of jQuery has been reduced with the release of 1.8?

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