1st Build, Steel, Epoxy 24"x24" for Wood

[JAZZCNC]

ok makes more sense now. When it comes to MS then speed of controller comes into play because the higher the MS the more pulses are required. So some lesser controllers cannot provide enough pulses to allow high feed rates a router requires. In which case you'd use a lower Ms amount.
In your case you have more than enough pulses so can afford to go higher on the MS. However going much above 2000 is wasted because steppers cannot resolve to much more than this.
The main advantage of higher MS is smoother motor action. Yes you'll lose little torque with high MS but not enough to worry about or even notice.

Typical MS for router is 1600 or 2000.
However the drives/motors and how they are affected by resonance can come into play when selecting MS. Some motor/drives combo's don't perform very well with certain MS settings because of resonance. This is esp true of some Analog drives which I think the Long's DM560B are, they are basicly Leadshine DM copies. So in cases like these you some times have to select different Ms setting to try move out of the resonance range.
Resonance will and does cripple performance so if you start getting stalling motors or struggle to get good velocity then chances are resonance is affecting the drives/motors.

Digital drives handle resonance much better so are not affected as much, if at all, it's also big reason why they perform so much better than Analog drives.