OK, adding all those parameters, I can run 5.2 with HDPi support and a normal responsiveness:

-Dcom.eteks.sweethome3d.resolutionScale=2 -Dswing.defaultlaf=javax.swing.plaf.metal.MetalLookAndFeel -Dswing.plaf.metal.controlFont=Dialog-12 -Dswing.plaf.metal.userFont=SansSerif-12 -Dswing.plaf.metal.systemFont=SansSerif-12



Still interested by a fix to be able to run the latest release though