Print dimensions changing with Laser Speed


I tried printing with different laser speeds. It looks like the dimensions of the print decrease when laser speed is increased. (I tried extremely low and high laser speeds also).Anyone knows why this happens and how to correct this?

It seems I will have to increase the size of the CAD model also when I increase the laser speed. But I am not very sure how much increase should be given. Does anyone have knowledge on this?

Also, the dimensions are not changing evenly. I found that dimensions in Z direction are not much affected, but the other dimensions are varying.