How is it on older or budget hardware though? It’s been a long time since I tried KDE, and in between even worked with Xfce because Gnome was a bit more resource intensive. Is it still the case that in terms of hardware specs and demand of the hardware, KDE needs/uses more than Gnome? I guess Xfce will be in a different league capability wise and resource requirement wise.
AIUI, they actually really made an effort to improve on that front, to the point that KDE is actually really good about resource use these days, which is eg. why it was picked as the default for the pinetab 2.
I use LXDE on my new boxes, but on a 15 year old machine I wasn't sure what the Linux distro had defaulted to. I was surprised to see it was KDE. That machine takes 30 sec to decrypt the disk encryption key (stupid proof of work functions!), but the desktop environment is as snappy as LXDE on high-end 2026 machines.
I haven't compared those two with XFCE recently, but they all seem fine these days.
I run it on my RK3588 based MNT Pocket Reform. I have to force the GL ES 2 backend because of, presumably, Panfrost bugs, but otherwise it runs well despite the fairly weak CPU and GPU.
How old and what budget? I spent a good chunk of the late 2010s rocking Plasma 5 on a machine with a first-gen i5. It 8 GB of RAM and an SSD, which probably helped, but it ran great!