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Since both chrome and safari use webkit to render - chrome should work too shouldn't it?

Granted - Apple's definition of open is "you should only use Apple products".

Nope. Google uses a ton of WebKit code, submits a lot of code back into WebKit proper, but they're doing their own stuff too. IIRC they wanted to have GPU acceleration for 3D CSS which apparently WebKit proper doesn't offer at this point or Google thinks they can do it better. You can't safely assume all WebKit based browsers are going to be equal.

WebKit proper doesn't offer at this point

I've got a radar open with Apple about Safari's performance (that I know WebKit people have at the very least seen) that essentially boils down to this reason.

Safari's WebKit has basic hardware acceleration through CoreAnimation (but it only appears to apply to the 3D transform properties)

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