nema 34 stepper but I am afraid the ardruino is not fast enough
Steppers are very very slow 1-10ms.
The Arduino 1000s of times faster.
No, _some_ stepper motors are slow.
That driver is a microstepping driver designed to power bipolar steppers from a supply of
upto 80V, so upto 100kHz step rate isn't beyond the bounds of possibility.
A high performance bipolar motor can go to 1000rpm or more with the right driver, which is already over 3kHz for
full-steps (30kHz for tenth-steps which is the GeckoDrive default I believe).