Comment 15 for bug 772177

I finally found a solution for this here: https://help.ubuntu.com/community/Metacity

You run "gconftool /apps/metacity". When the window opens, go to General and turn off "compositing_manager". That's it!

You won't get the nice drop-shadows around your window borders nor the nice thumbnails, but that's what was making alt-tab so slow on my old Dell Inspirion 6000.https://launchpad.net/~marcus-haslam