I had a very hard time creating a simple model for some telescope "glasses" in FreeCAD...
So, next best thing to try: OpenSCAD. And holy cow, a couple of minutes and the hour-long struggle was solved.
Now, I also discovered; sketching something in FreeCAD and then importing the DXF in OpenSCAD to rotate_extrude, is exactly what I needed!
I have to mention that I am biased - wrote a lot of PoV-Ray back in the day 😎
As a result... Or side-effect of some AMD undisclosed project,This #POVRay branch can apparently get up to 26% speed increase for some stuff provided you have an AVX512 enabled processor :
https://github.com/Srihari-mcw/povray/tree/feature_avx512_version1_final