MangoHud

How to install and use the MangoHud overlay layer for monitoring system performance in Vulkan and OpenGL applications

yay -Syu mangohud lib32-mangohud

Start a game with overlay

mangohud /path/to/app

For Lutris games, go to the System options in Lutris (make sure that advanced options are enabled) and add this to the Command prefix setting

mangohud

For Steam games, you can add this as a launch option

mangohud %command%

Or alternatively, add MANGOHUD=1 to your shell profile (Vulkan only).