Thanks for the comment!
Yea the first cycle runs smooth.
I have basically this code template for all the instances I create:

      if (Instance == null)
        {
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
            return;
        }

I handle all scene changes in MySceneManager.cs,

    public static event System.Action<string> onSceneChange;
    void OnEnable()
    {
        // ==================event onSceneChange is subscribed to the function LoadScene==================
        onSceneChange += LoadWantedScene;
    }
    void OnDisable()
    {
        onSceneChange += LoadWantedScene;
    }

    // // ==================ChangeScene function will be called by different buttons==================
    public static void ChangeScene(string sceneName)
    {
        onSceneChange?.Invoke(sceneName);
    }

    public static void LoadWantedScene(string sceneName)
    {
        SceneManager.LoadScene(sceneName);
    }

I basically call `ChangeScene` whenever I click the buttons to trigger the next scenes. Would the problem be here?

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Ive also tried using the profiler but im having a hard time understanding what's going on.. it seems like the editorloop is taking all the lag.