There are some settings in LightBurn that you might want to tweak in order to get the best out of both. This article describes how to configure LightBurn to get optimum results. The connection device you choose in new device is not critical. You can choose Gerbil or Grbl-M3 (uses just easy Gcode). Even the other profiles seem to work well.
Set the Baud Rate to 230400
By increasing the Baud rate you can get faster engraving speeds, it removes the communication bottle neck. Select Device Settings and choose the appropriate Baud Rate.
Set the Grid settings to mm/min
For some reason, setting the grid settings from mm/s to mm/min gives a better performance. So you can experiment with these settings. I speculate that this provides less overhead when converting coordinates into steps but not sure.
Speed and DPI hints
There is a relationship between engraving speed and DPI and the associated PWM frequency. The higher the engraving speed, the higher you need to set the PWM frequency via the Mini Gerbil settings command ‘$28’ (Grbl uses the $ sign as a token for configuration settings). It is set to default 5 which translates to 1.5kHz.
Curious about those $ settings we talk about? Have a read here …