This setting allows you to render the game at a higher resolution than you monitor natively supports, then downsample it to your native resolution through a process referred to as supersampling, thereby producing a sharper quality image. Alternately, you can downsample to a lower resolution, then upsample it for improved performance at the cost of image quality.
The benchmark shows Render Scale has an expected major performance impact across all settings. Given that and the minor visual improvement beyond 100 and major visual impact below 100, most should leave this setting as it is. However, 75% can provide a last resort framerate boost for the desperate (or 50% for the really, really desperate).
Affects the quality and sharpness of textures. In Overwatch, the biggest difference is seen between the Low and Medium settings (observe the Propane sign and Reinhardt's hammer especially), whereas the difference with High is much more subtle and difficult to notice.
The benchmark shows Texture Quality has no definitive impact on performance, although it is typically dependent on VRAM, so if you have less than 4GB, you may want to reduce this setting for better framerates (to Medium is fine; avoid Low if you can).
Texture Filtering Quality
This setting is supposed to alter the sharpness of textures, namely when they are viewed from a distance or an angle.
In these screenshots, the differences are most noticeable on the wooden railings and ground surfaces; quality improves significantly between 1X and 2X settings, as well as between 2X and 4X.
Testing reveals this setting has a small but steady performance impact as it is increased. If you're looking to gain a couple of extra frames, lowering this setting is wise; 4X is a nice balance, but lower should be acceptable as well.
Local Fog Detail
This setting alters the level of detail fog has in a given scene. In practice, I could see no difference when changing it.
Despite the utter lack of visual differences when changing this setting, it has a major performance impact, particularly when going from Ultra to High. Most everyone should set this to Low, although if you're cautious (although unlikely, it's possible it could be apparent in other scenes), High or Medium are good choices. Whichever you pick, enjoy a large performance increase at little or no cost.
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