Incredible lag for no reason
So I was just playing toribash as normal and I had it running at 50 FPS fine worked perfectly but then I turned it off and went back on it and for some reason I have incredible lag since then , it still shows 50 FPS and everything looks fine until I do any type of movement even with the mouse it totally lags out the game.... I tried to turn my computer on and off and it’s still there but everything else works fine. How can I fix this??