macOS High Sierra Mouse and Video Lag

I have a problem i was trying to play Quake III for the whole day… and every day i was heaving this dumb problem.

The Audio is ok but Mouse and Video is droping fps every 3 seconds please help :0

+i was using the test app bcs i cant launch the q3.1.36

You may or may not be having some issue on top of all this but I know High Sierra has issues with video lag - after so many sleeps/wakeups video (Radeon or Nvidia…) cards go slow.

The temporary work around is to do a full shutdown / reboot then FPS should return to normal. Or go back to Sierra.

This is widely reported with all sorts of games and graphics apps. For example: