Comment 4 for bug 1793530

not sure what is meant by the phrase:
" DXF file containing many thousands of tiny entities"

- the original svg file consists primarily of 64 circles.
- the file top.dxf consists primarily of 512 cubic splines. That means that each circle has been converted into 8 splines. This is admittedly more than necessary. 4 splines might have been sufficient. But this is not "thousands" of objects.

- the file 'top-from-cloudconvert.dxf' consists of about 25 straight lines per circle, for a total of 1600 straight lines.

the fundamental difference between these two files is that the Inkscape file uses splines instead of straight lines. I suspect that some intermediate software, not Inkscape, is probably converting the splines into 'thousands' of objects. You might want to experiment by sending a single large spline to your plotter to see how many objects you get from it.