Mine is set at 9000, works fine for me. I usually don’t run it faster than 6000 though, haven’t fully vetted it against skipped steps though. The developers posted somewhere 9000 or 10000 is the limit before it skips steps from the controller.
That’s not going to happen because the laser is planner synced, meaning to change laser power requires all motion to stop.
That’s actually one of the things I fixed in my firmware, enabling laser inline power from a later branch: Laser Pause While Changing Power - #40 by brent113