I didn't read all of these posts, but in my case I found a solution. I have a 
NVIDIA card, and in Ubuntu Additional Drivers I have two options:
 * NVIDIA accelerated graphics driver (version 173) 
 * NVIDIA accelerated graphics driver (version current) [Recommended]

Besides that I was using first option in previous releases of Ubuntu there were 
no problems with ALT-TAB but in 11.04 ALT-TAB was very slow. I changed graphic 
driver to the second option, and now it's very fast. 
Maybe some of you with this trouble can change a graphic driver? It helped me.

/Artur

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https://bugs.launchpad.net/bugs/299330

Title:
  Alt+Tab - switching applications delay. slow

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