Yeah so what? The game doesn’t even use 6 cores.
This is what Playground Games done in FH3 in 2017:
"Improved CPU Performance
We have observed that a large portion of players are CPU limited when trying to run Forza Horizon 3 at high frame rates, including locked 60 FPS and unlocked. By analyzing telemetry, we have developed targeted optimizations for this group of affected players by increasing the number of concurrent threads used by the render architecture. We have taken further advantage of DX12 capabilities to allow the visuals to be processed out of order during the frame, in order to reduce synchronization stalls and decrease CPU execution duration. These changes result in a significant CPU performance gain on High or Ultra settings when running on PCs of Recommended spec or better.
Updated Thread Model
We have updated our threading affinity model to make better use of all available cores. Along with this change, we have added a new graphics option to disable the new model, should you prefer. This option can be found in the Video Settings menu under “Threaded Optimization”."
The game was basicly unplayable before this patch.
Forza Motorsport needs the same treatment, a real PERFORMANCE PATCH. Come on Turn10 you can do the same to your game!
Process Lasso, and forcing Forza not to use Core 0 helped me a lot.