Max speed is depandant on more than just the screw since that is only one component of the system.
There is a nice stepper calculator in Member's Doc's where you can easily evaluate different axis parameters
and see the result.
Thus you need to look at the big picture namely, software, computer, drive / external devices, axis specifics ie; motor, screw, reductions etc, and the machine specifics.
Note that you must compare apples to apples and never apples to oranges even if you find a link.
RICH