I gave a lightning talk about Godot as a wallpaper engine replacement via ScreenPlay[1]. I hacked this together the week before the convention and I hope to release it by the end of the month.
- Query all windows and check if a full screen or maximized window exist, and then pause the wallpaper. I have a prototype for handling this on Windows.
- Limit frame rate via Godots Engine.max_fps. Also in general it does 100% depend on the wallpaper of resource intensive it will be.