COSMIC Alpha 4 Released For System76's Rust-Based Desktop

Variable refresh rate (VRR) allows your display to match the framerate of an image source, such as a game — and doing so prevents screen tearing. Support for VRR has been added to the cosmic-comp compositor and Displays Settings. You can set VRR to be either always on or automatic, which will enable VRR for fullscreen content.

Source: https://blog.system76.com/post/cosmic-alpha-4