Unity3d: script execution sequence on scene loading gameobejct

scene 1 Script

public class LoadScene1 : MonoBehaviour
{
    
    // Start is called before the first frame update
    void Start()
    {
    
        StartCoroutine(StartScene());
    }

    IEnumerator StartScene()
    {
    
        AsyncOperation aync = SceneManager.LoadSceneAsync("LoadScene2", LoadSceneMode.Additive);
        while (aync.isDone == false)
        {
    
            Debug.Log(aync.progress);
            yield return null;
        }
        Debug.Log("LoadOK");
        yield return null;
    }
    
}

scene 2 Mount on an object

public class LoadScene2 : MonoBehaviour
{
    
    private void Awake()
    {
    
        Debug.Log("Awake");
    }
    // Start is called before the first frame update
    void Start()
    {
    
        Debug.Log("Start");
    }

    private void OnEnable()
    {
    
        Debug.Log("OnEnable");
    }

    private void Update()
    {
    
        Debug.Log("Update");
    }
}

scene 2 Screenshot

Output after execution


You can see , load LoadScene2 complete , Will execute LoadScene2 All in GameObject Of Awake,OnEnable,Start, and update Will execute once , After loading the scene
therefore , When optimizing scene loading , The code level focuses on the inherent in the new scene GameObject The complexity of executing logic in the script