It is all power saving in a computer and laptops change the voltage going to the processor all the time (Changing the speed). So as the load on the computer changes your pulse stream will change (Not a simple problem).

You will have no problem with a good desktop

Brian,

I looked at the windows setting file and changed some settings in windows at my notebook.
The result is excellent!
The motors run very smooth now.
I've also changed the motor settings, now 2000mm/min and 300mm/sec2 with no problems
Old settings 500mm/min and 40 mm/sec2
No matter what screen I'm using.

Thank for the help right now.
Next thing is to make my electronic cabinet all wired up and then mill my first part.