Valve implements a sophisticated FPS limiter for Steam Deck that allows users to refine performance to extend battery life. As The Verge notes, Valve has revealed that Steam Deck will include a built-in frame rate limit option that limits performance for longer battery life in exchange. It seems that these settings allow the user to have more control over performance of the games running on the device, allowing him to prioritize the performance of the game and extend battery life of the hardware.
Battery life is still my concern
I like the idea of this