That’s good. I don’t have a lot of run time on my machine. It sits there most days. So I don’t mind running pretty slow to make sure I don’t end up with a big pile of scrap. I am sure I can push it harder, but to really answer the question, someone needs to tune up a machine to reasonable defaults and just run jobs deeper and faster until there are problems.
I can’t think in anything/minute. I just don’t judge time that way (unless maybe I was trying to estimate total job time). Inches/sec ends up too small for my head too (0.5in/s seems like it is not that much different than 0.25in/s). So I prefer mm/s to visualize speeds. But maybe that is just my weirdness.