I have solved the issue by changing the view hierarchy within the NavSplitView-DetailView: moved a supporting view further down the view hierarchy. This removed the need to update a Binding between the primary view (in DetailView) and the supporting view. Without the Binding the issue does not happen.

iOS 18.2 beta 3 does not fix it, either.

Thank you for the confirmation that my findings are registered and investigated as an actual bug. I will keep testing and reporting.

BTW, I have this slowness problem only on an Intel i7 iMac. It works fine on an M1 MacBook, even with both simulator platforms installed (14.3.1 built-in and 15 RC downloaded).

I had the same problem - a very slow simulator, launching an app took minutes. I guess the reason has been a conflict between Xcode 14.3.1 and Xcode 15 RC on the same machine with two different iOS 16 simulator platforms installed. The one has been the built-in iOS 16 simulator that comes with Xcode 14.3.1. The other has been a downloaded iOS 16 simulator platform on Xcode 15 RC. As soon as I deleted the downloaded iOS 16 platform in Settings/Platforms in Xcode 15 RC the troubles were gone.

The lag issue for German voices seems to be solved on iOS 17. I have successfully tested it on iOS 17 beta / Xcode 15 beta 2 a few weeks ago.

Clarification: the first sentence should read "...the change of German VOICES from one utterance to the next..."

In this sample project the AppDelegate and the PersistenceController both conform to ObservableObject. Why?

@openingapps Have you found a solution? Have you filed a feedback with Apple? Would be great if you could so. My Feedback number is https://feedbackassistant.apple.com/feedback/11380447.

I looked up the source code associated with the video: Your are right, SelectedSort is a struct defined within the View. So all is well! :-) Thank you for your answer!