A good crash-test for #geogram: one of the standard OpenSCAD test file, but with a level-5 Menger sponge (instead of level-3 in the original), intersected with a diagonal plane.

There are 100K facets with intersections, and some of them have several thousand intersections in the same facet.

Final mesh has 1.4M vertices and 3.8M faces,

The CSG engine and the geogram+ arithmetic kernel marketed by Tessael go brrr !!!

https://github.com/BrunoLevy/geogram