Printing at higher speeds is better than printing at lower speeds

user

Printing at higher speeds is better than printing at lower speeds. Frimware version 1.0.4. MKS gen l motherboard. Filament - Medium flex.
https://imgur.com/a/SsuoWmE

Repetier

That is normally not the case, but it can happen e.g. if stepper frequency is near resonance frequency of printer it vibrates much more. Or steppers have problems holding microstep positions which is more prominent on slower speeds while faster speeds have motor running and the angular momentum makes it run smoother.