Hello @ranrud, “Inches / mm/min” means that distances will be shown in inches while speed values are indicated in mm/min. This is for users who are comfortable using Inches as units of measure for designing but would like to use mm/sec speed settings usually provided by manufacturers or other forums online. Here is thread explaining the same:
On the other hand, please check if your laser head is damaged or if the laser is out of focus, usually a 10W laser cutter should be able to engrave slate much higher speeds.
