Stuff isn’t naturally blurry. Rendering images can be thought of like taking a picture but unlike taking a picture there is no need to “focus”.
Cameras and our eyes have lenses to focus light into a point and everything that is blurry is not properly focused. Since when you render an image there is no need to “focus” the image, you end up with a detailed image where everything is in focus. To achieve a depth of field, the image must be blurred which adds computational time.
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