How to MouseMove many times VERY QUICKLY

It seems that MouseMove has a delay between each MouseMove call.
I'm aware of the speed parameter, which has been set to 0, so movement is instant.
However even if I call MouseMove repeatedly within a While-loop, there seems to be a significant delay between each call.
How can I reduce this delay?

; An example:
For $x = 0 To 100
	For $y = 0 To 100
		MouseMove($x, $y, 0)
	Next
Next

I'd like for the above code to scan over the 100x100 pixel area in a matter of a couple seconds.
Currently it takes many many many minutes.