A simple KDE plasmoid to toggle desktop compositing.
https://www.pling.com/p/1596521/
Install from KDE's widget browser
Download the latest release from github or the KDE store and run kpackagetool5 -t Plasma/Applet --install /path/to/archive
Manually copy the contents of the archive to ~/.local/share/plasma/plasmoids/org.kde.plasma.togglecompositing