About performance: I got it running 20 fps on old SBC Rock64 in OpenGL mode and was GPU-bound. Well, Mali-400 is not a gaming GPU and ARM blob drivers don't even support OGL, only GLES.
On i5-2xxx it runs on about 110-120 fps with 30% of one CPU core load(GPU-bound again) in X11 and ~90 in kwin_wayland.
I didn't like how you had to pick up weapons from the map in the normal modes when I played on a LAN but instagib mode was hella fun. Fragging three people while bunny-hopping into the flag room and fragging two more on the way out is something you just have to experience.
Xonotic has quite a bit of config options, e.g. it's possible to spawn with all weapons. But mastering those is a learning curve, compared to the more approachable instagib.
It’s kind of weird how picking up weapons on the map is a thing that kind of died out with arena shooters. I guess you probably didn’t grow up with those kinds of games?