Lightburn 0.9.16 on Windows 10, connecting to a K40 with Mini Gerbil over about 4 feet of USB, not hubs. No issues present with vector cuts or engraves (fill, outline, and both). Steppers and gantry are keeping steps and run smooth.
I am experiencing stuttering issues at the beginning of any job engraving images. In one case, the stuttering lasted for the first 50 seconds and then self-resolved. I experimented with adding a dwell command in the G code but that only delayed the job. A 50 second delay would be followed by a 50 second stutter. I exported the G Code and ran it in CNCJS without problem.
I saw this post and tried the suggestion of switching between tabs during the job. If I started a job and immediately switched tabs a few times between console, laser, and move, the stuttering would self resolve and the remainder of the job would function perfectly.
Let me know if I can provide any other information helpful in tracking this issue down.