Optimized Forza Horizon 6 white Xbox Ally (Z2A) settings (steady 30fps)
These are the settings I'm currently using for the game. It gives the best possible image quality while still maintaining 30fps during custom 24W manual mode when plugged in. FPS might drop slightly to 27-28 fps in the main city if on standard 20W turbo mode.
Notable settings:
Car reflection quality: this thing eats FPS. When set to Low reflections on the car will update once every 2 frames, which looks a bit janky at high speed but fine at crusing speed. Setting this to High (updated reflection every frame) will tank the FPS when you're in the city. Lowest just looks awful, updates once every 3 seconds or so. Set to Low in my config.
Shader quality: 1fps difference between low and medium, but low makes cars paint looks weird in your garage. Set to medium in my config.
Audio quality: game is not CPU limited so this should be set to Ultra; enjoy your engine sounds people.
Lens effect: Medium makes raindrops stick to the screen while Low doesn't. It's a pretty effect that has basically no impact on performance. Set to Medium in my config.
Motion blur: Long motion blur and ultra quality motion blur helps make the game look very smooth. Lower setting levels don't look as good, especially Medium and below.