I was recommended a distro that doesn’t use Gnome (Lubuntu). The system I was working with is very old and some light research made it seem like Gnome is pretty resource heavy.
How old are we talking about? 10+ years ago I was running Gnome3 on decent hardware of the time, and everything was snappy[0]. Now all the OS software got faster since then, so everything is still snappy on that thing despite that hardware now being old. Similarly that laptop came with Windows 7 and that was snappy, and the Windows 2021 LTSC on it is also snappy[0].
0: I care about responsiveness, so I've always disabled animations on every device, so I have no experience if some animations can run at 60fps on some hardware and 30fps on others.
Instead one should recommend using KDE or Gnome and turning down all of the graphical settings if needed to improve performance.