It makes no difference. I am simulating at a laptop at home (not the real system at the factory) but it behaves the same (same lag). Try say G0x50000, feedhold, cycle start, feed hold, cycle start, etc. The system travels a considerable distance before stopping. That may not be all too important. I just observe that (with Fanucs, Sinnumeriks etc.) operators use feedhold and cyclestart frequently when they trial cutting a part for the first time and I want my Mach3 to behave the same. It does not seem to be an acceleration issue. Its the time it takes from the moment the command is issued to the moment when Mach resacts.