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Just curious, why it so faster in Safari then in Chrome?

My guess is that Safari rendering system use hardware acceleration and Chrome doesn't.

The bottleneck here is not javascript, it is the browser rendering system when applying all those css 2d transform.

Yep. Safari runs a 3D CSS demo/benchmark/unrealistic-stress-test I made much smoother than Chrome.

I'm kinda sure it has to do with hardware acceleration.

Would totally make sense given it works best in the two browsers most closely tied to the underlying OS.

I was totally impress by the speed of IE 9 running in a virtualbox instance on my macbook pro. Times they are changing!