Unplayable bad performance on system that mostly exceeds minimum specs.

Hello, i saw u talking about about input lag and mouse lag in ur post.

When i did not move my mouse the game runs smooth as F*, but when i started moving my mouse i dropped like almost 80 FPS.

this fixed my lag in game:

My mouse was on 1000 pollingrate, i put it back too 500 and my lag was gone.

Maybe its worth a check/try?