I’m not sure if this is the place for bug reports, but didn’t see anywhere else obvious jump out at me.
Anyways, the setting for X acceleration on engrave isn’t being taken into account. Simulating an engrave at 5 mm/s2 and 50000 mm/s2 gives the exact same ETA (which obviously doesn’t match reality.)
Version: 0.9.09 beta for camera compatibility
OS: Confirmed on W10 and OS X (latest release version LB on Mac)