I have an NVidia GTX 960 (edit: also tried a Quadro M4000) on a fresh Ubuntu 16.04.1 install. The rendering performance is pretty terrible, see stuttering video.
It looks to me like it has a really hard time context switching. When I have multiple windows open, it takes a second or two to get focus into a new window. I didn't have any of these problems with my previous Iris Pro graphics computer in 4k, so not sure why a several hundred dollar video card can't keep up.
I can't be the only one trying to do this, anyone have it working? I am currerntly on the nvidia-370 graphics drivers, but I've tried everything down to 35X-something.
Turning off vsync on both compiz and nvidia, as well as completely disabling chrome GPU functions has made it more usable.
If I open up something else that is GPU bound, like a Steam game, the performance goes right to crap again. Really looks like its related to GPU context switching performance being atrocious.
Performance has gotten much better adding these to my /etc/profile:
export __GL_SYNC_TO_VBLANK=0 export __GL_YIELD="USLEEP" export __GL_THREADED_OPTIMIZATIONS=1