I have a Lenovo yoga 300 with 4GB ram. Not my only machine but I have tried many many distros on it and all have had appalling performance issues, until I installed ubuntu MATE 21.04 on it. This was right about the time it was released. Its been on here ever since and looks likely to remain for quite some time.
I was a big fan of Ubuntu when Gnome 2 was the state of the art back in the Karmic Koala days so this is a big of a revisit really. Though I have to say these days MATE is a big improvement over anything out those days. When Gnome 3 came out I moved to KDE and ran Kubuntu, Mepis and Manjaro for quite a while. I only moved back to Gnome 3 after Pop OS came out.
My main laptop runs Fedora 34 and runs Gnome 40 a treat but then with 8 cores and 64GB RAM it ought. I've been running Linux since I installed Suse off a single CD back in the early 2000s.
Anyway I've gone a little off topic, I just wanted to stand up and be counted as another Ubuntu MATE user and comment that I believe this to be the best Ubuntu release these days.