This is likely the known problem reported in bug #1199877 and has probably already been addressed. Please update to the currently available package versions in Ubuntu 13.10 and let us know if this fixes the problem for you.
** Changed in: unity (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1250282 Title: Menu response is very very laggy.... To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1250282/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs