Full Shading
Full Shading mode is designed for hard edged, sharp objects like rocks. When Full shading mode is active, the visible portions of the material are shaded and can be affected by light sources.
Since light sources can affect portions of your material, shadows will appear within the object. This can greatly increase rendering time. If you don't need to see shadows in the object, make sure the Receive Shadows filter is disabled. Usually you should disable this filter unless you're creating very specialized effects.

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