Performance issues after reseting PC

Hello, I've recently reset my PC to factory settings, reinstalled drivers etc. Dolphin seemed to work out fine, but the turbo mode caps at much smaller FPS. I'm using Mario Galaxy to test, it doesn't hold 160FPS in the title screen and in the comet observatory doesn't go over 90FPS. Also, a warp zone in Beach Bowl lags a lot.
It used to go much higher than that last month before the reset, and my CPU/RAM/GPU can take much more according to the task manager