SteamOS 3.5.5: The Biggest Steam Deck Update of the Year!

Display color adjustments, HDR, VRR, undervolting controls, updated Arch base…
Steam Deck Client Update Adds Visual Tweaks to UI, HDR Badges for Supported Games

Plus easier toggling of Steam Input being on or off.
Steam Deck Client Update Allows You to See Shader Cache Size, Adds Low Latency Option for Streaming

Plus support for the PowerA Switch Nano gamepad.
Tony Hawk’s Pro Skater 1 + 2 Gets Offline Fix - But Only for Steam Deck

Might work on desktop with -steamdeck launch parameter though.
Undervolting the Steam Deck: Is It Worth It?

Are there actually benefits to APU temps and battery life?
Easily Install GE-Proton, Luxtorpeda, and Boxtron on Steam Deck with Wine Cellar

All within the comfort of Game Mode.
Looking To Increase Performance on the Steam Deck? There’s a Script for That

Be aware there are some caveats to running the script.