I solved the micro stuttering in an unthinkable way.

My system
CPU :Ryzen 2700x
M/B :TUF B450M
RAM : 8GB DDR4 2666@3400 x2
VGA :Vega64
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PC version Forza Motorsport 7 will know all about micro stuttering.
However, in Task Manager, the process preference of Forza Motorsports 7 is
only 1 ~ 3 except 0, so the micro stuttering disappears. why?? Yay!

Forza Motorsport 7 does not need 16 threads.
confident that just three threads are enough?