Thats just it, I never print that fast, even on a dedicated machine. Do you have a need for such a big z axis? I have 8 printers and have been at this for many years and even at a design job always needing prototypes I never printed anything taller that 6″.
If you accelerate too fast you will get ringing, to slow and you will get soft corners. The acceleration I had set in the firmware (200) was the slowest I could go before getting bad prints at 25-30mm/s.