I noticed that Whonix (in particular whonix-ws) uses a lot of RAM.
It seems to me that this is due in part to the fact that it is based
on KDE . So how can I disable KDE in it and switch to xfce (in
both the gateway and workstation)?
In any case just wanted to say that KDE takes a lot of memory (see the RAM consumption comparison above) and for a system like Qubes there’s no noticeable difference between KDE or xfce (since by default Qubes uses xfce). And since most people who would like to use Qubes have at least 4Go (like my case) it would be nice to see more lightweight environments like xfce come by default to Whonix.