This one has been requested frequently, and ended up being relatively straightforward to do, so LightBurn will soon have a ramp mode for producing engravings with sloped sides.
Here’s a comparison of a preview of a test file from RDWorks and one from LightBurn, with identical settings. The LightBurn one was generated in 0.8 seconds, while RDWorks took a touch over 4 seconds. (I’m hoping the RDWorks version looks as bad as it does due to preview artifacts - I’ve honestly never run one of these before)
Assuming testing goes well, this will be in the next release.