The issue with Unity hooking all screen updates and making them much slower and more CPU-intensive was bug 988079. So please test that fix in Ubuntu 12.10 (or a fully updated 12.04). I recommend 12.10 because you will get better performance and more of the latest fixes, than 12.04 has.
** Changed in: compiz (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/884387 Title: Compiz is absurdly heavy on CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/884387/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs