Fairly wierd lag problem
So, I have been having this problem for a few weeks or so now. First noticed it while playing Dark Souls 3, but the same is happening on youtube now so yeah. The problem is that whenever I move the cursor (mouse/touchpad, all the same) while on fullscreen (atleast with youtube vids) the game/video gets hella choppy, like, 10 fps.
Any idea what can be causing this? I remember that when it happened with DS I did nothing prior to it happening that could trigger something like this.