gnome-shell-extension-gamemode 6-1 (ppc64el binary) in ubuntu jammy

 GameMode optimises your system for peak performance when running a game.
 .
 This shell extension will show you whether GameMode is active and for which
 windows.
 .
 If you have the Debian gamemode package installed, you can test this
 extension by running: /usr/libexec/gamemode-simulate-game
 which should pop up a notification that gamemode is running, and
 that it has stopped after 10 seconds.