@vogelchr Thanks! For now, I generate the HPGL with Inkscape, which is more than configurable enough for me. That also means I can limit the parser to the HPGL subset Inkscape emits (e.g. no circles).
The Inkscape plugin also claims to do some path optimisation. I haven’t checked that so far. For the test plot above, the problem is mostly duplicate lines and really the SVG’s fault.
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