Slow horizontal movement.

[Foggon]

So I am at my friends house playing on his setup.. The biggest problem is that when I am in 1st person(or scrolled out into 3rd person) When I right click to look around it moves very slow HORIZONTALLY.

Only horizontally though, and no other time does it do this. Even if I fit F9 to another camera and move the camera with right-click.. it moves at a normal speed.. Wtf mate?

Anyway I hope someone has the answer.. but likely few will view.. and no one will ever respond to this thread.