3D Resolution - Aka renderer. This setting is best left with the same resolution size as for the interface, in other words 100%, any value above that will squeeze more detail under same pixel density which may improve quality but will take a on performance greatly. In the most extreme cases, if you really need performance gain, set 3D renderer on 50%, this will give 2/3 performance gain but make everything look pixelated and blurry, less noticeable with higher resolutions.