[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

Yeah it’s counterintuitive but blurring in real-time is actually very hard to do. Especially if you want it to be a decent quality blur. Lowering the resolution doesn’t cut it and isn’t usually how DoF blurring works in games, it’s not as simple of a problem as it seems at first glance.

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