I too would LOVE real-time updates in multiple 3D window views while designing, but I also understand that stability is more important, for sure. Perhaps a happy medium: where the 3D Views, when toggled to wire-frame mode, would allow for this, while the solid mode would continue to require a refresh. Maybe? Please? Cheers! - Ed.
Edward Wolfstein, AIA, NCARB, MRAIC, CSI
Wolfstein Architecture
Burlington, VT 05401 USA
macOS High Sierra 10.13.3
4 GHz Intel Core i7
32 GB 1867 MHz DDR3
AMD Radeon R9 M395X 4096 MB
ArchiCAD 21 (USA Full)