-There is a small performance overhead to find which Diffusion Profile a Material users. This means that the fewer Diffusion Profiles you use, the faster this process is. Rather than limit the number of Diffusion Profiles you use, you can use the **Diffusion Profile Override** to optimize the search process. If you have multiple Scenes, and each one only uses a single Diffusion Profile, you can use this override on a global Volume in each Scene to select a Diffusion Profile per Scene, instead of placing the Diffusion Profile from each Scene into the HDRP Graphics Settings. This reduces the resource intensity of the search in the Shader. This technique is particularly effective if your Scene contains a lot of overdraw to produce visual effects like foliage and vegetation.
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