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I’m not sure about the uno but we hit the processing wall on the z-axis on the mega.
Check your step rate, step/mm, and how fast the uno processor is.
On the mega with 32nd stepping and 5/16″ we max out the processor at about 16.8mm/s for the z axis and 197mm/s for the x and Y. Huge difference. If you can step down to 16th stepping and you can go faster.