Hi,
so I've encountered a problem after I installed the game. When I'm trying to run and move a mouse in the same time to left or right, Geralt keeps running to the side for quite a while. It kind of happens when Geralt is not moving, just looking around by moving the mouse, but it doesn't bother that much, because it's not as annoying as it is when running. When he runs, it just keeps going to the side, even if i moved mouse to the opposite direction and he is just running to the side for like 2 seconds.
Hope you know, what I am trying to explain here.
And yes, I tried with GOG Galaxy off- it still lags.

Try the alternative movement setting.

Yeah, tried it. Still nothing. Same with enabling hardware cursor.

If you have a controller and use the keyboard, unplug the controller and see if that works.