Mouse X-axis speed

[Flipmode]

Have a problem with my mouse x-axis speed which is too slow. I cant bind A and D to strafe because of turning by using mouse look is way too slow. Looking up and down is quick and smooth, but on the sides it pretty much no use unless I sweep my mouse across the mousepad multiple times.

So far I've tried increasing mouselook sensitivity in game, but it seems to have little to no effect, except for the Y-axis.

wut do?