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Mission Control has been horribly slow on my 2011 MacBook Pro 15" (2GHz quad i7, 8GB RAM, 256MB graphics, SSD) -- swiping up usually freezes the screen for 2 seconds, before showing me the Mission Control layout. I've tried switching to discrete graphics only, but the problem doesn't go away.

It seems others have been experiencing this, too, and it might be a video driver issue. Has anyone found a fix for this? One MacRumors forum post suggested disabling automatic scrollbar overlays, but that hasn't helped.

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FWIW Mission control works fine on my 2007 MacBook! So you mist be having a driver problem. Are there any other circumstances where graphics freeze up? –  dan8394 Aug 2 '11 at 8:38
    
Not really... Launchpad is decently fast. I tried this out on a 2010 MacBook Air as well, and it was much faster than on my 2011 MBP. Also worth noting: this is a fresh install. –  yjsoon Aug 2 '11 at 9:13
    
Lots of people are reporting slowness - can we close this and track How can I disable animation when switching desktops in Lion? –  bmike Aug 9 '11 at 21:01
    
It's something that, while it may not be unique to your system, is certainly special about your system. I have a similarly configured 2011 MBP, and on either video card, with or without external monitor, I have seen no slowdown. I also have a 2011 MBA i5, and have likewise seen no delays either on the internal or external monitor. –  mmc Aug 10 '11 at 18:22
    
@bmike - not quite the same topic, but ok to close anyway since I don't see many others facing this issue (and I'm not in a position to test it any more). Accepted the solution below, will leave it open for a couple more weeks. –  yjsoon Aug 29 '11 at 6:36
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1 Answer

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Only a couple of suggestions, and neither is sure to work, but worth a try.

Safe boot - Start up in Safe mode with the Shift key held until the progress bar appears. Select Restart (normally) at the login in window. Safe boot mode does a Repair Disk during boot.

Re-install the OS - Your data and settings will be preserved. There may have been a glitch in the original installation that could be fixed this way.

BTW, have you tested for this problem by logging in as a different User?

I have 3 Macs on Lion: 2007 iMac, 2009 mini, 2011 i7 MBP, none of which exhibit this problem. This leads me to suspect that those with the problem have some 3rd party software in common, especially since it happens in such a wide range of Macs.

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I'm afraid I didn't have the chance to test most of these before I sold my MacBook Pro for a new Air (where I'm happily unaffected). I can say that re-installing didn't do anything, as I did a clean install of Lion. It might be something app-specific which didn't play well with the MBP's graphics card. –  yjsoon Aug 29 '11 at 6:34
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