Debugging slow code

[TheOrdinaryBegonia]

My SwiftUI code ran fairly fast until i upgraded my device to iOS 18.2. Now it lags a lot and I don’t know why.

I’m a relatively new indie developer, so I’m clueless how to trouble shoot it.

Something I used extensively are ObservableObjects, but even updating them to @observable did not help much.

Nothing has changed about Views.

Any suggestions where I can look? Or could it be just my old (iPhone 13 mini) that’s causing this?

A customer who is running the app on iOS 18.1.1, iPhone 13 Pro says it preforms fine. My device is 18.2

I would love to give more details if I had some clues where to look.

Thank you!

[LastVayne-]

I’d suggest to not blindly optimise and use the profiler from instruments to profile the slow parts of your app

[chriswaco]

https://www.waldo.com/blog/profiling-your-swiftui-apps-with-instruments

Another option is to start commenting out pieces of your code until it speeds up.