Hello! I made a machine on grbl CO2 40w, it cuts normally, and the engraving is very slow. each line burns out slowly, increased the speed but does not react. Maybe there are some nuances in the program?
Have you set your acceleration values to be very slow in GRBL?
In the Console in LightBurn, enter ‘$$’ followed by ‘Enter’, then copy + paste the results here for us to review.