With HAGS enabled, I get random hangups which last for 1-3 seconds. They look a lot like gpu driver crashing and then restarting itself, but I can't find any logs of such with Event viewer. I've also had occassional game crashes. So far I have only tested these on couple of different Quake games and they both run at several hundred, even thousand fps, which maybe has something to do with it? The hangups occur a lot more often if I also enable message signaled interrupts for the GPU. HAGS disabled I haven't ran into such problems. This happens on Win10 2004 with i7 6850k and MSI Gaming X 1080ti, running Quake Live from Steam. Oh, and I also have that weird delay in the animaton, when dragging certain windows around the desktop, for example CPU-Z. edit: Doing a clean install of Win10 2004 fixed the hangus for me completely.