I installed lion last night. No problems at all, until today randomly Mission Control started to play up. It glitches/laggs/is slow, whatever you want to call it, and its driving me nuts! Every time I enter it, all my open windows lag whilst 'flying' into the mission control screen. Even switching through desktops with the two finger swipe on the magic mouse laggs. I don't know what I did, but I'm sure its Mission Control itself, as LaunchPad is still as smooth as silk when i swipe between pages.
I've done everything, repaired permissions, repaired the disk, executed everything from onyX, and even did a PRAM reset.
Someone help me, PLEASE D:
EDIT: Don't worry, I fixed it. I started experiencing the problem after I had installed Autodesk AutoCAD for Mac 2011. I uninstalled it and still had the problem. Its been 4 days, and I just reinstalled it to see if it was the cause. Turned out it was, and after the uninstall this time, my iMac is back to normal: Fast. No glitches with Mission Control or any other animations at all.
It seems like Lion is having its hiccups with third party software. But I guess that will always happen with new OS's.