FWIW the SteamDeck running official SteamOS does have a full desktop environment, it’s just hidden by starting Steam in Big Picture mode.
So… you could benchmark the “gain” but I doubt it’s significant, if any.
Also if you do like to play with hardware for gaming across networks checking Selkies or Moonlight to stream from your machine to your machine, no intermediary, little latency or overhead.






I haven’t tested this myself but I assume one could benchmark both and see if there is noticeable performance loss.