Mission Control slow and jerky on 2011 MacBook Pros: any fix?
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.