Wayne Pan benchmarked JavaScript on the iPhone 3.0 beta as compared to the 2.2 release and found performance improvements of 3-10x for various calculations:
Wayne’s blog adds some details and includes a spreadsheet with the raw results.
It appears, based on research done by Ajaxian (using their Webkit detector) that 3.0 could be using the native-code generating Squirrelfish Extreme JavaScript interpreter.
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