Comment 66 for bug 657976

Okay, some more info - more usefull ;)

update-apt-xapi gets up to 99% cpu and stays like this for long periods, but this is not the problem because this happens only occasionaly

The main problem seems to be the mutter app which is unoptimized. Everytime I launch something mutter starts to eat > 50% cpu...
Moving the mouse over the side menu alone makes it eat 80% cpu!