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Whenever I switch tasks in Ubuntu (ALT+TAB), the switch takes place instantaneously but I have to wait a second before I can use the new screen because the task preview window comes up after the switch, stays on the screen for a moment and then disappears before I can use the new screen. Anyone know how to fix this?

("task preview window" = the window that displays miniature views of each of your open tasks)

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I'm assuming you are using Compiz? Are all the other effects running well? – prestomation Nov 6 '09 at 22:02
I can't find any indication that compiz is installed (but I'm not sure how to check definitively). I understand it's more resource-heavy. Is that why you asked? Yes, no other display problems. – lipton Nov 6 '09 at 22:08
You can check if compiz is installed using dpkg. dpkg -l | grep compiz – John T Nov 6 '09 at 23:08
John T: Thanks for the command. Yes, it is installed. I don't see an entry for it under System -> Preferences or any of the menu items underneath the Appliations menu on the taskbar. – lipton Nov 7 '09 at 0:32
I wonder if disabling compiz would be enough to speed things up? – lipton Nov 7 '09 at 1:16
up vote 2 down vote accepted

Try disabling compiz from 'System->Preferences->Appearance' then go to the 'Visual Effects' tab and check 'none'. Then try switching windows and compare the results.

I find the compiz task-switcher completely unusable and unfortunately there is no way to disable only the compiz task-switcher, you have to disable all effects. So, it's your choice, usability or fanciness!

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I had problems with alt+tab and compiz in Ubuntu 9.04. But after upgrading to Karmic everything is fine.

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