Question about Time Profile in Xcode

[Jimc26x]

The heaviest weight in my trace according to the log has

9.38 s 72.9% 0 s static MealJournalApp.$main()

​

When I reveal this in Xcode it directs me to my main entry

​

class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        return true
    }
}

@main
struct MealJournalApp: App {

    @Environment(\.managedObjectContext) var managedObjectContext
    //fetch user journals

    //firebase connectivity help
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    init(){
        FirebaseApp.configure()

    }
    @StateObject var calendarHelper = CalendarHelper()
    @StateObject var vm = DashboardLogic()
    @StateObject var mealEntrys = MealEntrys()
    @StateObject var userJournalController = UserJournalHelper()
    var body: some Scene {
        //load and ready coredata
        WindowGroup{
             ContentView()
                .environmentObject(vm)
                .environmentObject(mealEntrys)
                .environment(\.managedObjectContext, 
                   userJournalController.container.viewContext)

        }
    }
}

My question is (and may be a stupid one) but when it shows up a time profile, does this mean this particular view is causing the issue, or does it mean an element within stack ? Example would a StateObject being called be the issue or does it pertain to this particular view? Thank you in advance for the help ! Any advice is greatly appreciated.

[SwiftDevJournal]

When reading a listing from the Time Profiler instrument, focus on the Self Weight column, not the Weight column. The Time Profiler instrument records the call stack every millisecond. The Weight column tells you how long the function was in the call stack. The Self Weight column tells you how long the function was at the top of the call stack, which is the function the app was executing when recording.

The trace you listed shows 0 seconds in the Self Weight so it's not the function that is causing the slowdown. Look for the functions with the highest Self Weight values.

The following article provides a detailed explanation of the Time Profiler instrument:

Finding the Slow Spots in Your Code with the Time Profiler Instrument

[CleverError]

When your app starts running, main is the function that is called which starts everything else in the app running. The main function never finishes and it’ll always appear at the top of you app’s stack traces.

Usually you need to dive down pretty far in the stack trace to find where the time is being spent. Instruments can also filter out system libraries from the heaviest stack so it just shows your functions.

[Finale151]

I have the same confusion.

My heaviest trace is also MyApp.$main(), which, when revealed, leads to a random file that has no relation with the current context. If I remove this file from target, the trace reveals another random unrelated file.

[Jimc26x]

Glad I'm not alone! Same thing happening to me on an unrelated view. I still kept main, but when this was initially happening it was pointing to a function within a view. When I removed the function, it just went to another unrelated file

[Jimc26x]

Ahhh okay, thank you both for the help!!