[el Filou]

On most (all? I never remember which ones have a problem with it) GPUs, native DXVA2 decoding does not give full quality chroma, so the idea behind that Trade quality for performance option is that as you already don't have the highest quality subsampled chroma to start with, it's better not to waste processing power by using madVR's high quality scaling and to just use the GPU's DXVA algorithm for chroma upscaling too as it's faster and less power hungry.