Install SteamOS beta preview
Use Proton GE 8-3
In Bios:
- UMA: 4G
- Audio DMIC Clock Control: 768KHz
Steam Deck Performance Settings:

- Framerate limit: 30 fps

- Allow tearing: Off

- Manual GPU Clock Control: 1500

- Scaling: Off

In Game Settings:
- Resolution: 1280*720
- Window Mode: Fullscreen
- View Distance: Medium
- Shadow Quality: Low
- Anti-Aliasing: High
- Texture Quality: Medium
- Visual Effects: Medium
- Post Processing: Medium
- Foliage Detail: Low
- FOV: Default
- VSync: On
- Ray Tracing: Off
- AMD FidelityFX: Quality
- Motion Blur: Off 
- Film Grain: Off 
- Chromatic Aberration: On

EXTRAS: Usage Sharing: OFF

The "maytheperformancebewithyou" mod is an absolute must right now