public float scaleOfAllRenderTargets { get; set; }

A value of 1.0 uses the default texture resolution specified by the display provider. Values less than 1.0 use lower resolution textures, which might improve performance at the expense of a less sharp image. Values greater than 1.0 use higher resolution textures, resulting in a potentially sharper image at a cost to performance and increased memory usage.

When this property changes, textures are always reallocated, which can negatively impact performance. To dynamically change texture resolution on the fly, consider using _scaleOfAllViewports.