Hay DraxFX,
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I’m pretty sure it changes your shader complexity (Scalability shading), so if you dont have any complex shaders or stuff like that it wont really effect your fps.
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Scalability Textures: this is similar to the first one but for textures, meaning that you may notice less detail is certain materials. e.g. missing bevels, low res cracks in concrete, normal maps not having as much strength.