Simple script for reduce memory consumption in GNOME 3. Tested on Fedora 29 Worksation with GNOME 3.30 version.

wget https://raw.githubusercontent.com/tim77/reduce-gnome3-ram-usage/master/reduce-gnome3-ram-usage.sh

Run as regular user (non root):

sh reduce-gnome3-ram-usage.sh

Reboot.