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Only Chrome can fix an issue in Chome. Safari for me is fast enough now. I uninstalled Webkit.
 
Mission control and other stuff in the OS works better. not sure yet why the kernel_task take 1gb of ram :Z i will feel it someday
 
The SMC firmware update 1.1 fixed the "jerky" scrolling when the HD4000 was in use (set to auto GPU switching).

10.8.3, with the Safari update (and, i assume, updated Webkit), improved smoothness when scrolling while zoomed in (it was actually one of the items in the update's release notes).
 
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