In Gnome with Compiz I have a similar problem. Try to disable the desktops effects. It's work for me in render problems, but do not solve the performance bug found in https://bugs.launchpad.net/bugs/262758.
In Gnome with Compiz I have a similar problem. Try to disable the desktops effects. It's work for me in render problems, but do not solve the performance bug found in https:/ /bugs.launchpad .net/bugs/ 262758.