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.

  • Exactly what do you mean by "not smooth"? Is the animation jerky? Are there graphic artifacts?
    – Vickash
    Jul 4, 2012 at 23:07
  • i mean, the animation of scrolling or resizing windows
    – valter
    Jul 14, 2012 at 0:53

1 Answer 1


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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