The Velocity in motor tuning determines you Max rapid speed.
Jogging will go at full rapid speed unless you have a slow jog % set. If you do then pressing the shift key then a jog key will override the slow jog. You can see by pressing the Tab key whether you have a slow jog % set.
G1, G2 etc moves are commanded by a feedrate so if its too slow you need to command a higher feedrate, for example if you have G1X1F10 it will move to X10 at 10 units per min, if you had F100 instead it would move at 100 units per min.
The only other thing to check is that you are not using G95 mode, that is feed per rev, normally on a mill you would feed in G94, Units per minute.
Hood