If you're using bumblebee, https://github.com/Bumblebee-Project...bee/issues/241
has details of a bumblebee VGL transport plugin you can use that might improve performance.
Unfortunately it makes no difference to the nvidia 304.43 driver, which still crashes and locks up X with the usual Xid errors.
And nvidia actually are making some attempt to support prime (http://www.phoronix.com/scan.php?pag...tem&px=MTE3MzY
). If they can get that working, all they have to do is fix their long-standing driver crashing bug and we might have functioning nvidia cards again...