I think you are right. I have a rtx 3080 and I have the same issues. When I scale the Archicad window to a smaller scale on the screen it fixes the issue. And trace is also a no go for me. I have also found that closing certain apps helps too. I also...

Have you considered the monitors you are using. It could be due to the double 4K setup. I have noticed that Archicad feels sluggish on my 4K 32” monitor but smooth on a regular 1080p monitor. Both having refresh rate of 60hz. I have wanted to try a h...