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https://www.airspayce.com/mikem/arduino/AccelStepper/classAccelStepper.html says "The fastest motor speed that can be reliably supported is about 4000 steps per second at a clock frequency of 16 MHz on Arduino" which is pretty poor - teacup can hit something like 10× that when controlling 4 steppers, and also comes with a non-blocking state machine based gcode parser ;)
NOTE:
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Hence, a higher number means a more popular project.