after a lot of trial and error i have the motors turing properly on my plasma table with mach3 but my rapid speed is much slower than it was in mach 2  when i try turning it up it make a loud crunching sound is there some tricks to tuning i have missed i have tried enhanced pulsing pulse width accel and velosity settings but cant get the same smooth motion i had with mach 2 the only thing working properly is the step motion 10 " is 10"

Have you tried using a higher Kernel speed - Config/Ports and Pins - bottom left hand side. I understand this alters the speeds at which Mach3 puts out info to your computer. I think this is new and did not appear on Mach2.