This incorporates the fix mentioned in bugreport #1046
I suspect this is caused by the HardDPMS option, which is enabled by default now. When active, this limits the frame rate to 1 fps when DPMS kicks in because otherwise, applications would start rendering as fast as possible.
However, that limit shouldn’t be applied for displayless setups like Bumblebee. I filed internal bug 2775447 to track fixing that.
Though not sure whether it was fixed on the nvidia side by now
This incorporates the fix mentioned in bugreport #1046
Though not sure whether it was fixed on the nvidia side by now