Disable window content while dragging @ gnome+metacity Ubuntu 20.04

Question

How to disable gnome display window content while the window is being moved?

Among many other things, I tried:

gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory -s -t bool /apps/metacity/general/reduced_resources true

From here: https://forums.fedoraforum.org/showthread.php?103724-How-to-disable-gnome-showing-window-content-while-moving-window

And I also tried this: How to disable window effects in 15.04?

Nothing worked.

My configuration:

OS: Ubuntu 20.04.1 LTS x86_64 
Kernel: 5.4.0-1025-aws 
Shell: bash 5.0.17 
DE: GNOME 
WM: Metacity 
Theme: Adwaita [GTK2/3] 
Icons: breeze [GTK2/3] 

Answer 1

In a terminal as the user:
gsettings set org.gnome.metacity reduced-resources true

works instantly on my metacity 20.04