u/black_fang_XIII

• 8 GB GPUs should reduce the environmental textures to "High." This also limits the geometric quality to "High."
• Car Reflections are best left at the highest quality. If you're on a lower-end PC, drop down to "Low."

https://preview.redd.it/2z8n05gb362h1.png?width=1140&format=png&auto=webp&s=e7322a7624e3607ae5902271e4c35ba66cb29f88

• Screen Space Reflections should be enabled over ray-traced (unless you've got the extra headroom). "High" is the sweet spot, but Extreme is only a few percent slower.

https://preview.redd.it/j8t2a4fc362h1.png?width=1140&format=png&auto=webp&s=eb292b9945f67d9e79f7135008c6dc22c45ac4df

• Screen Space GI is recommended for most midrange PCs. "High" is the sweet spot.
• Ray-traced GI medium is ideal for high-end PCs, preferably with quality upscaling.

Complete Guide: https://pcoptimizedsettings.com/forza-horizon-6-pc-optimization-best-settings-graphics-performance/

Video Guide: https://youtu.be/5FmZjiUkwVE

In-depth RT Comparisons: https://pcoptimizedsettings.com/forza-horizon-6-pc-performance-guide-optimized-ray-tracing-settings/

• Path tracing is only feasible if you’re willing to enable frame generation. Otherwise, it’s too taxing unless you’re on a 90-class GPU (or 80-class at 1440p).
• Ray tracing is highly performant but low-resolution. The reflections, in particular, are prone to excessive noise and boiling artifacts.
• Ray-tracing is best paired with native or quality mode upscaling for optimal fidelity. Despite producing visual artifacts, RTGI can dramatically improve diffuse lighting.
• Shadow quality is best set to “High” for optimum performance and VRAM usage.

https://preview.redd.it/pm67kv9l8kzg1.png?width=1140&format=png&auto=webp&s=3a116697a132c0a5c7114d05f968fdfc4dffc206

• Path tracing overrides raster shadows, but the latter setting can still affect VRAM usage. You can lower it without any loss in fidelity with PT.
• Ambient Occlusion should be disabled when using ray-tracing
• Ambient Occlusion and Contact Shadows should both be disabled with path tracing.
• Leave shadow caching enabled; it improves the performance of dynamic shadows by up to 15%.
• Hair is best left at "High." If you can't afford the extra VRAM usage, set it to "Low." Medium looks strange with the low strand count.

Pragmata and Resident Evil: Requiem use ReSTIR GI and NEE to implement path tracing while keeping the per-frame ray count manageable.

ReSTIR reuses light paths temporally (past frames) and spatially (neighbor pixels) to accumulate the best light samples. This includes reusing second-bounce paths for surrounding samples.

More on that with diagrams here: https://pcoptimizedsettings.com/pragmata-pc-optimization-guide-best-graphics-settings-comparisons/