Not counting the Steam Deck, since KDE isn’t actually turned on while you’re running games.
Normally I’m a Gnome guy, but I’m building a tiny low power portable computer and wanting to keep resource utilization low, so I’m investigating other options.
Hyprland + waybar and bemenu. Not truly a DE, but I love the look and the minimalism and I like to do things in the CLI anyway.
maybe something like xfce or a tiling window manager would have the lowest recurce cost
Hyprland it is really clean and “easy” to use for a Windows compositor
sway