[ELI5] Why does Depth of Field (DoF) setting in video games usually take a toll in performance?

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By blurring the background. Your basically lessening the need to render and reduce resolutions. So it would logically make sense for the increase of the games FPS. However it seems it turning on does oddly the opposite? And I wanna know why that is

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Anonymous 0 Comments

You still have to render all the shapes and pixels, except now you also have to calculate which ones need to blurred, and by how much, and how that impacts neighbouring pixels.

It’s computationally much harder. At no point are you reducing resolution. That would just make things blocky.

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