After clean boot with only Chrome running idle, Compiz is taking 25% all the time. It keeps my fan running non stop. Is this a regression or something?
closed as off topic by jrg♦ May 21 '12 at 20:43
Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined in the FAQ. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about closed questions here.
I was having the same issues. This thanks to the PPA of Daniël van Vugt, compiz CPU usage dropped from 40% avg to 5% avg, also GPU temperature dropped about 15°C when idle, and a drop of about 30°C (!) when stressed.
However, the PPA is still experimental and for me it creates flickering when switching workspaces at the moment. The fix is being worked on and it will land in the normal updates if you have enough of patient (more than a month is possible I guess)
I think it is because you don't have graphics drivers installed. Try installing the correct drivers for your card and reboot and check again. Compiz is supposed to run on your graphics card but if you don't have drivers it can't run there, so it runs on the CPU.