Mesh Brep operation slow in Rhino 8

[Japhy]

I created a youtrack RH-84278 to investigate, this is similar to this issue recently reported.

'Perp Frame' Component Runs Slow in RH8 / GH

Hello all, I’m having an issue with the perp frame component in Grasshopper, Rhino 8. The component runs super slow in Rhino 8. I did a comparison with the same curve, same components, in Rhino 7 it seems to be reasonable. (screenshot attached, showing rhino 8 runs almost 10 min vs rhino 7 about 45 seconds) [image] [image] Initially I thought it could be caused by the changing from .Net Framework to .Net Core, but after testing in both modes using the setDotNetRuntime Command, it seems in R…