after disabling desktops effects it is possible to work...
this one is quite bad :-/ $ glxgears
351 frames in 5.1 seconds = 68.535 FPS 631 frames in 5.0 seconds = 126.155 FPS 662 frames in 5.0 seconds = 132.250 FPS 596 frames in 5.1 seconds = 117.785 FPS 353 frames in 5.0 seconds = 70.579 FPS
after disabling desktops effects it is possible to work...
this one is quite bad :-/
$ glxgears
351 frames in 5.1 seconds = 68.535 FPS
631 frames in 5.0 seconds = 126.155 FPS
662 frames in 5.0 seconds = 132.250 FPS
596 frames in 5.1 seconds = 117.785 FPS
353 frames in 5.0 seconds = 70.579 FPS