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You might be affected by:

https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/763005

There is a series of known bugs where the window manager picks the wrong refresh rate resulting in choppy animations.

I noticed that this happens consistently with all compositing window managers (compiz, xfwm4, mutter) except kwin.

Disabling VBlank syncing may help. The bug report above has instructions to disable VBlank syncing with Compiz/Unity.

If you are using mutter (gnome-shell) you can put this line in /etc/environment, restarting your X session afterwards

  export CLUTTER_VBLANK=none
However, in my experience, Unity/compiz becomes sluggish again after a certain amount of clients are displayed on any (virtual) desktop.


lvillani, yes, the nvidia form of this bug and its associated work around has improved the performance of Unity with my old desktop significantly. Lots of searching Ubuntuforums and the interweb had not turned this up, so thanks.

https://bugs.launchpad.net/ubuntu/+source/linux-restricted-m...




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