To be honest, I have used Pop!_OS, Manjaro KDE, Mint XFCE and Fedora 35 when I was away from Zorin OS and what I have observed is that all three of them GNOME 41, KDE Plasma 4.22 (I think) and XFCE 4.16 consumed almost the same amount of resource on a core i5, AMD Radeon, 4GB RAM computer with KDE Plasma consuming slightly lesser than XFCE and XFCE consuming slightly lesser than GNOME. But overall XFCE and GNOME were more stable and responsive than KDE Plasma. I think, gone are the days when GNOME used to be "just a beefy fat dude".
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