"Example: Your mouse was set to 800 CPI and you used 2.3 sensitivity in Counter-Strike, then you need to set your Ikari Laser to 1839 CPI and your Counter-Strike sensitivity to 1. This will make you free of interpolation."

source: http://www.steelseries.com/int/products/mice/ikari_laser/information?utm_source=website&utm_medium=banner_728x90&utm_campaign=ikari_laser

whats interpolation?

up

I think it's some driver issue, because the only kind of mouse movement interpolation I heard of is when mouse dpi differs from the physical resolution of the sensor. For example 600 dpi is interpolated value, beacuse resolution of the sensor is 400 or 800.
But I may be wrong.

wtf?

yea...
wtf?

wazauP?