It's probably worth asking upstream (Kwin) about that specific KDE effect. I'm not familiar with that effect, but they are probably doing something that the binary driver doesn't expect (and that used to work only by accident). Just a thought.
** Changed in: nvidia-graphics-drivers-304-updates (Ubuntu) Status: In Progress => Confirmed ** Changed in: nvidia-graphics-drivers-331-updates (Ubuntu) Status: In Progress => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1402551 Title: High memory usage of Xorg and kwin after Xorg security updates [nvidia] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1402551/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs