Anyone has a workaround for this?

I am running SH3D 6.3 on Fedora 31, and I experience the same thing: 3D is very "snappy" but plan view (and GUI in general) is barely usable because very slow.

I tried the x-Java3D-1_5_2 script and also tried using /usr/bin/java in place of the bundled java runtime but this does not seem to change much. I even tried the -Dsun.java2d.pmoffscreen=false and -Dsun.java2d.opengl=true suggested here: https://sourceforge.net/p/sweethome3d/bugs/854/ but to no avail.

I can post more info if useful. I would really like to use this software that looks perfectly suited for my needs… except that the plan view is too slow.