
Game is very smooth (40 FPS) wih some changes in game display settings :
- D. Mode : windowed
- vsync : off
- FPS limit: 60
- FPS limit(event): 30 ( this is for the cutscenes only )
- HDR: off ( very bad with HDR)
GENERAL :
- presets : custom
- super resolution type: AMD FSR3
- AMD FSR3: Quality
- Sharpness: 0.0
- Frame generation: on ( you need to use windowed display mode otherwise the display will be flicking)
- Ray tracing: off
- anisotropic filtering: 16x
- Shadow quality: Standard
- effects quality: best quality
- global illumination : Standard
- reflections: standard
- foliage: standard
Post effects:
- only turn on the lens flare and bloom .
Changes in steam deck overlay :
- frame limiter : 40fps
- TDP: 15W
- GPU frequency: 1600mhz.
OBS: you can use proton experimental or custom GE Proton 9-5 . The game needs to be with these settings with you can maintain 40 FPS stable and smooth, otherwise the game will be unstable. I tested almost 3 hours with all settings and these are the only ones that works pretty well. The game will be with power consumption at 21.5 w because is a very power demanding game because of the unreal engine 5. The game is an amazing Remake of ninja gaiden 2 series, the graphics and mechanics are excelent . I highly recommend for all fans of the franchise like me . I hope it help you.

No tinkering necessary, works out of the box. Low fps during cutscenes but otherwise very smooth.