Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#1

Post by atomlib » Tue, Sep 26, 2023, 5:41 AM UTC

Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load
twitter.com

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#2

Post by DRAGONERO » Tue, Sep 26, 2023, 9:13 AM UTC

That's probably a good amount of battery life that can be claimed back once this is fixed

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#3

Post by aranw » Tue, Sep 26, 2023, 9:16 AM UTC

DRAGONERO wrote: post #2

That's probably a good amount of battery life that can be claimed back once this is fixed

The fix will be ready for the next macOS Apple Event so that they can claim battery performance improvements

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#4

Post by alberth » Tue, Sep 26, 2023, 9:20 AM UTC

Is FB13204831 the bug ticket?

https://nitter.net/tomaskafka/status/1706403105661722849#m

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#5

Post by danpalmer » Tue, Sep 26, 2023, 9:24 AM UTC

This is such a classic UI programming bug, and almost every UI programming framework has a way to achieve this accidentally using core components. React is notorious for this, but even in non-declarative frameworks it's very easy to get a reactivity loop on a trigger or model update and do this.

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#6

Post by robjwells » Tue, Sep 26, 2023, 9:33 AM UTC

I wonder if this is a bug introduced in macOS 13 (Ventura). I've been watching the Activity Monitor inspector for Control Centre on my 2017 Air, running 12.6.8, and it's at 0.00, occasionally boosting up to 0.01.

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#7

Post by Kiro » Tue, Sep 26, 2023, 9:47 AM UTC

What does "even though there is no UI visible" mean?

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#8

Post by lloydatkinson » Tue, Sep 26, 2023, 9:48 AM UTC

https://tonsky.me/blog/disenchantment/

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#9

Post by andreasley » Tue, Sep 26, 2023, 9:49 AM UTC

Kiro wrote: post #7

What does "even though there is no UI visible" mean?

Control Center is an overlay that is only shown when the appropriate icon in the menu bar is clicked. https://support.apple.com/guide/mac-help/mchl50f94f8f/13.0/m...

Re: Control Center on macOS is always re-rendering its SwiftUI causing 1% CPU load

#10

Post by andreasley » Tue, Sep 26, 2023, 9:51 AM UTC

Can't reproduce this on macOS Ventura 13.6 on a Mac Studio.