If you play around 1) older machines, or 2) desktops in VMs, it's handy to know what uses less memory. I used to use XFCE in these circumstances but have switch

If you play around 1) older machines, or 2) desktops in VMs, it's handy to know what uses less memory. I used to use XFCE in these circumstances but have switched to LXDE based on comparisons like these. Good balance between memory usage and utility/familiarity.