Low FPS as a result of P99s fixed framerate?

[Shnoogs]

I'm having a similar FPS issue. I'm returning after a couple years and found my FPS is an abysmal ~35. When I played previously I wasn't having this problem. Nothing changed with my hardware: i5-6600k and 980ti in Win10 Home.

I tried most of the same fixes as OP with no change. Also tried messing with Windows "Game Mode" but that didn't work either.

Anyone else have any ideas?