I played Alan Wake 2 last winter on my Steam Deck, fearing I would get spoilers before I build my PC. Now that I have built it, I will proceed with The Final Draft and the DLCs.
Heroic Games Launcher and added to the Game Mode. Native resolution with FSR2 set to Quality preset. Most of the game ran at 25-30 FPS. Frankly, the game is quite slow-paced. Only problematic spots were the first boss fight in the forest during rain and the final shootout near the end of the game where it dipped to 17-18 FPS.