Man, KDE is heavy. Plasma-desktop takes up 194MB here (which matches nicely with his +7MB openbox session), but Kwin, as most KDE users will arguably have, adds

Man, KDE is heavy. Plasma-desktop takes up 194MB here (which matches nicely with his +7MB openbox session), but Kwin, as most KDE users will arguably have, adds 99MB. So a total of 293MB for KDE. Almost double as much as Gnome 3.