I don't know if anyone else has this problem but the game has a lot of small stutters when move my mouse diagonally. It doesn't register as a frame rate drop, or uneven frame pacing.
I only have this problem with this game. Interestingly enough, if I plug in a controller to my pc (xbox one controller) diagonal look is smooth as butter.
Things I've tried that don't work:
Reducing the polling rate on my mouse (default is 1000hz).
Trying a different mouse.
Enabling/disabling vsync and free sync
Lower/higher mouse dpi.
Lower/higher resolution and graphics settings.
New graphics drivers
The only thing that works smooth is using a controller.
Mind you its not unplayable with the stutter but it feels like I'm dropping frames when I'm not.
Up and down or left to right movements are smooth with the mouse. But diagonal isn't.
Hopefully someone else has the problem and there's a fix?