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Control center is responsible for drawing a bunch of the ui on the top right of the menu bar, things like the clock (many comments here seem to be saying this is related to showing seconds), Wi-Fi, sound settings, etc.

It also shows the annoying overlay bit when you accidentally open it :D

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Indeed! When "Display the time with seconds" is enabled for the menu bar clock, Control Center sits at 0.8% CPU activity instead of 0.0% on my Mac.

I think part of the confusion is that there's the feature "Control Center" and the process controlcenter so you would reasonably think it's only involved in the marketing feature's UI.

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