[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

Depth of field uses the original rendered data and calculates how much each part needs to be blurred in post processing, probably with gaussian blur or similar.

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