Hello. So, this was on sale for like 3$ so I picked it up, as I really liked the other games in the series. Game works great, absolutely smooth. EXCEPT, when I move the mouse to look around, then it stutters really bad. It's not that the FPS drops, it's like it drops the mouse DPI to 5.

Is there any fix to it ? I've googled everything I could think of, no solution.