What I MEAN is that if there haven't too much work to do, the better solution is to call sleep rather than use spin lock.
In total 1515s CPU time, effective time is 711s, the SPIN Time is 802s.
The program is NOT CPU-HEAVY. In fact, It's SPIN-HEAVY.
THAT is what I want to express or describe.
By the way, it seems that using NVIDIA panel to limit frame better than using the option in game.