GNOME Shell uses 3D acceleration if available, software rendering otherwise: https://fedoraproject.org/wiki/Features/Gnome_shell_software_rendering

GNOME Fall back certainly is lighter. That said, my wife uses GNOME Shell on her laptop with 2 GB of RAM and does not seem to ever swap.

Two links to visit to enjoy GNOME Shell to its full potential:

https://wiki.gnome.org/Projects/GnomeShell/CheatSheet
https://extensions.gnome.org/

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