Just like the title says. I've been playing Witcher 3 perfectly fine over the last few days, getting around 60 FPS. I was doing completely fine today in the morning, but I got on this afternoon and it started lagging. I have tried reinstalling, updating all my drivers, restarting pc, turning off shadowplay, raising priority, resetting settings, just about everything. I monitored my usage, and my usage never broke 50%, and my temperature was always below 60C. How can this happen? it feels like the game is just suddenly not using my CPU and GPU. And before you suggest, yes I made sure the game used my dedicated GPU.