Steam Deck Optimized Settings
In short, don't bother playing Stalker 2 on Steam Deck. We managed to see 30 FPS on the performance overlay for more than a fleeting moment by setting everything to low, using TSR, and setting the resolution scaling to 35%, but the stuttering and the average performance of about 25 FPS made the game unplayable. Enabling FSR frame generation made stuttering much worse as well as introduced massive amounts of input latency.
Even if we had managed to hit a stable 30 FPS, the image quality was so bad that we wouldn't recommend anyone play the game with those settings. The game looked worse than
Doom running in Windows Task Manager.