Z axis speed?

I am using Repetier firmware on an SLA 3D printer via an Arduino Mega/Ramps 1.4.
The printer has a Openbuilds V-Slot Nema 17 linear actuator and two end stops. That is it!
Everything works very well, except I can't change the speed of the z stepper. It travels VERY slow.
Even if I use a g-code terminal and directly send g-code.. For instance:
G1 Z-200 F500
should send it down very quickly, but it does not.
How can I change the range of the z-axis speed?


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