On commercial controls I believe the control has two different following error limits, one for Rapids the other for Feeds.
Feeds obviously have to be accurate but the rapids dont have to be so accurate so often they have a larger following error for them allowing a faster rapid speed.
With Mach you dont have that so your rapid will be your max feed. It will depend on your motors and drives how accurate things are at the max speed, some drives you can set the following error to what you want, others its fixed.
Hood