For long time now I've experienced slow task switching if done by any other method than mouse clicks on the taskbar, particularly when using Alt+Tab. I finally got around to doing a search for a solution and came across a very helpful forum thread. As it turns out, compiz is the source of the problems (as it has often been in the past).
One thing to try first is the change detailed here. I haven't tried this myself, but it leaves the rest of the system intact at least.
The alternative (which I tried) is the step detailed in the original thread I found.
gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool false
Note that this will turn off a few fancy effects, though nothing that was at all important for me. I honestly can't see any difference except that switching is much much faster.
Edit:
Looks like I spoke too soon. Despite being faster for a while, it was soon back to the sloooow behaviour. I have now followed the instructions in the other blog post and it seems to have fixed it properly. The package you want there is compizconfig-settings-manager btw, he doesn't mention the name in his post.
Edit2:
Again, the cycle of being fast for a while and then back to the old behaviour. The changes I made are still intact. Guess I'll have to chalk this one up to "Ubuntu isn't ready for real use yet" (again).
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