Just have to say, after months of suffering, I tried Win 7 today and it was pure bliss to play again.
If anyone else suffers poor performance, try "upgrading" from Win 10.
The difference is really huge, with Win 10 there was UI lag and stuttering from min 0 in any game/replay and it could get very bad later on, like 20 fps at min 15 or 8 fps at min 30, with horrible stuttering and UI lag. (Yes, I have tried 100% fresh win 10 installs on separate ssd's with different drivers and whatnot)