this is a servo system with 1200oz/in drives at least on X,Y,Z and a 1200oz/in stepper on the A. so I guess microstepping only applies to the A axis and I'll take that into consideration. the base period was 49000 with the old slow machine and this old faster machine is around 35000 so I'll start there. By the way, you can get 128gb internal SSDs on amazon now for like $14. So I bought a few and I'll config them for the older and newer linuxcnc.
Thanks for all the help.
Jerry