You can now open Settings > Personalization > Desktop Background, and choose any .webp image as the background.

Stop fighting with your PC just to set a wallpaper; Windows 11 is finally embracing WebP files natively.

Microsoft is also thought to be testing video backgrounds, but that's still missing from the latest preview build.

To improve performance on Windows 11, you can safely end processes like unused apps, bloatware (e.g., Copilot, Phone Link), high-resource processes, and peripheral-related programs via Task Manager.