Brilliant, that's exactly what I was thinking too.

the reason I asked is that many threads go on about tuning for high speed, must go this speed etc. but then I realised that plasma itself is limited (at least in home size machines) to speeds of around 750 to 4500mm/min so what the heck is the point of mega speed.

as you said, acceleration seems to be important and on a machine with an envelope of 600x600mm, 20,000mm/min is pretty scary and damaging.

i think I'll limit mine to 5000 max.