Application launch sequence

Middle PRO

Before main (pre-main)

1. The user taps the icon, the kernel creates the process and loads the binary.
2. dyld loads dynamic libraries (system ones from the shared cache — fast; frameworks embedded in the app — each costs time), binds symbols, runs static initializers and ObjC +load.
3. The entry point runs. In a UIKit app it is @main on the AppDelegate (or an explicit UIApplicationMain), in SwiftUI — @main struct MyApp: App.