And up to 3000 mm/min which I think it is 100+ ipm. It works ok with this speed. Anything higher shakes the gantry when it stops.
If you need faster than this you might want to think about putting belts on the x and y and gearing them up.

It would improve the speed if you could up the voltage to the drives. Nema 23's might have been a better choice!!

If you change the micro steps then you have to change the "steps per" to get the same distance travelled.