I don't know if it's a fair comparison, but with nothing else but htop running, the unstable version running on virtualbox is only using 540 GB RAM compared to my Solus Gnome daily driver has 960 GB RAM (which is still pretty good compared to fedora or debian gnome, both of which were well over 1300 to 1500 GB with just htop running). I do have a couple of eye candy extensions added to my bare metal install, so that may make some difference.
Not an extensive check of everything yet, but all appears to running quick and smoothly 😃