update:
been busy with work and and life! but i managed to get some interesting configuration info from the net. the cncitalia forums have some excellent tips on configuring the usovo MF70 controller box to work with mach3. Unfortunately they are all in italian, but with the help of google translator and a bit of common sense I was able to get some details. they appear to be very rapid, i'd imagine the machine is running at the maximum speed it can without losing steps. I havent done my 1st cut yet, more tweaking required because i'm not confident if these settings are safe when force is applied (i.e when cutting stock) but atleast i've got the machine running 200% better than it did before. I'll try post these details when get sometime at home.