I was affected by the same symptoms but I'm not using Compiz. The culprit was Metacity Compositing which I disabled with the command:
gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool false Problem solved (for me), hope that helps someone. -- Alt+Tab - switching applications delay. slow https://bugs.launchpad.net/bugs/299330 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs