I wonder why the performance varies so much depending on the car I drive. I measured the FPS on starting grid at Silverstone with 15 cars, and these are the results I got. Radical: 44 FPS USF2000: 62 FPS Civic: 57 FPS FISI: 72 FPS Especially the Radical is striking, almost twice less FPS than with the FISI. Is it a matter of tuning LODs or are the shaders that different? Surely Radical shouldn't be that much lower than the USF, both have less complexity in the model than the Civic for instance. I think in DX11 optimizations we speak about a few % of gains, whereas with a car like Radical we lose 20%, so maybe the optimization needs to be more focused on content.