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Scrolling is no longer smooth on my iMac, neither is resizing windows by clicking the (+) button. This is happening just to my user, I created another user for testing, and everything was smooth with the new account.

I already restarted the computer, and already finished all running programs. Nothing works.

My iMac is mid 2011 i5 2.5 Ghz and 16GB RAM, running OS X Lion 10.7.4

Thanks for any help.

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Exactly what do you mean by "not smooth"? Is the animation jerky? Are there graphic artifacts? –  Vickash Jul 4 '12 at 23:07
    
i mean, the animation of scrolling or resizing windows –  valter Jul 14 '12 at 0:53
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1 Answer

Sounds like something might be stealing all your processor cycles - run Activity Monitor (in the Utilities folder) and see if anything stands out as the culprit.

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