Thank you for your replies, I will try DPC thing. As for IRQ, I don't know what that means, unfortunately. Also yes, I already disabled many services and followed some optimization guides (which I didn't think I would with this system, but oh well). I even used a Windows Tweaker tool which fortunately didn't break my system. In fact, I think it improved some things which I did not expect at all. Anyways, it did not harm so that's good. I even tried gaming on a very fresh Windows install, only drivers and programs that are needed for the game specifically, but nothing. My system is having really odd issues indeed. You know that animation when you right mouse click on your desktop and it brings up a menu like refresh, paste, etc.? That fading animation is also kinda not smooth, as if it was 30fps rather than my stock 75. My father's Celeron notebook runs that animation much smoother even with a 60hz display. And scrolling in Chrome is also smoother for him. My "kinda powerful" PC is definitely not working like one. So leave useplatformtick on yes, enable HPET in BIOS and then run bcdedit /deletevalue useplatformclock? Thank you. EDIT: I may try these versions again. As for resetting BIOS, it never helped unfortunately.