Patch 4.03 for The Witcher 3: Wild Hunt added a Steam Deck preset making it easier for users to get a solid experience on the Deck without tinkering with each graphic setting.
If you want to tinker your settings and get the best The Witcher 3 performance on the Steam Deck, you can follow Cryobyte33 guide here.
The Witcher 3 Steam Deck Preset
