Faster speed just makes the treatment tolerable. If you can go slower sure go with that, but it will hurt more, many put it on the fastest setting. You do not need 1.5mm, .75mm to 1mm is shown to be effective, start lower and build up if needed.

Ah ok, so no actual benefit to going slower other then pain threshold. I've been using 1.5m with a dermaroller anyways but thank you!

@BelloniSlower you go the deeper the pen goes in right, as the pen action has more time to provide depth, ... and more pain 😉