BlenderBIM 0.0.200621 imported Uptown.ifc now in a reasonable time without noticeable errors. In about an hour. But the import and option to use PCU multiprocessing is good.
The overall score
- ArchiCAD & BricsCAD BIM (undecided due to computer specs)
- BlenderBIM (FOSS!)
- Nemetschek Allplan
- Autodesk Revit
Autodesk AutoCAD Architecture (did not finish)
Other flavors?