Try using a Survey Point. Have a dedicated Survey point layer. Import DWG as xRef, place a Survey point with all needed attributes to where your project origin will be. Set project orientation, hide the imported drawing and Survey point layers. Start building.
It's better if your project location is near X=0 and Y=0, as it's not big numbers Archicad has to deal with.
If you are far from the coordinate origin Archicad (and many other CAD platforms) may struggle with 3D and possibly even 2D display.
Look for more info here:
| Archicad 4.55 - 26
| HP Z840 | 2× E5-2643 v4 | 64 GB RAM | Quadro M5000 | Windows 10 Pro x64
| HP Z4 G4 | W-2245 | 64 GB RAM | RTX A4000 | Windows 11