I have added

options nvidia_new NVreg_Mobile=1
NVreg_RegistryDwords="PerfLevelSrc=0x2222"

and so far so good. I had similar problems and it was driving me crazy
but setting the performance level to a set number seems to work.

Is there a way to mod the PerfLevelScr to a lower setting so it doesn't
burn the GPU so much when using hard graphics driven apps, say at
setting 1 or even 0?

-- 
Occasional screen-wide "blink" when using opengl apps (compiz also) and Nvidia 
cards
https://bugs.launchpad.net/bugs/164589
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