Thanks for the advice. I turned it all the way down, it removed the "laggy" feeling however the mouse sensitivity is still very unstable. My mouse sensitivity is quite high by default, I play games like BF4 without problems, but now I have to move the mouse all over the mouse pad in order to rotate myself 180 degrees. I even tried to maximize the mouse sensitivity settings in the game but it's still very slow, however for some reason in some places the mouse sensitivity is extremely fast. I tried lowering the video settings to the minimum again, but the problem remained. I have the feeling it's a problem with the game itself, I hope I'm wrong though.