Some people recently claimed in some benchmarking thread on the linux reddit that KDE now consumes less resources. Afaik even less than XFCE. Same happened back then on github qubes-issues when qubes introduced XFCE. So it would be maybe a good idea to do some benchmarking first, in particular for stuff from buster which is not that far away and would be the likeliest target for a new desktop environment.
I haven’t found any mentions of this. Please provide.
What I did read though was that XFCE works better in low RAM
environments. KDE might be even faster than that but requires more RAM
for that. Since RAM is limited in Whonix, this would still point at
XFCE. Also KDE might have better rendering speed on real hardware, but
that again wouldn’t effect Whonix in VMs much.
It was horrible to change from Whonix-Gateway from 512 MB RAM -> 768 MB
RAM; and Whonix-Workstation from 768 MB RAM to 1024 MB RAM.