I did a quick Google search for this machine and it looks as if the current version uses ballscrews, according to a French web site. I'm sure that ballscrews will be better than trapezoidal/acme - could make the machine faster, less load on motors, more accurate (less backlash). However, this does depend on the structure of the machine being able to take the increased loads without bending or twisting.

It looks as if the machine normally comes with a Kress spindle which might also limit performance. Another forum member (Cropwell) has recently improved his machine by adding an extra spindle mounting block.

The Leadshine drivers should be good, and if you wanted, you could then go to a 50V or 55V power supply for a little bit of extra performance, although again that depends on whether the machine structure will take the load.