Hi, to confirm, I'm still having the issue since a year ago, even on the latest 
ubuntu.
I observe 3 or 4 seconds (more with more open windows) before the alt-tab 
window appears. During this time, the system is not responsive, and thus I lost 
the habit of using alt-tab, using the mouse to switch app focus....
This only happens when using compositing with metacity.
While we could expect that compositing should not be used with metacity 
(software rendering), compiz has issues with multi-monitors, and compositing is 
necessary for several media applications. 
As stated in the previous message, changing the order of the alt-tab treatment 
would be best. A simpler fix would be to be able to modify thumbnails options, 
such as turning it off.

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

Title:
  Alt+Tab - switching applications delay. slow

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