Async Scene Creation

I load scene anync.

AsyncOperation asyncLevelLoader = SceneManager.LoadSceneAsync(name);
asyncLevelLoader.allowSceneActivation = false;

When scene Loaded I activate it:

asyncLevelLoader.allowSceneActivation = true;

Atfer that game stuck for few seconds because of thousands GameObjects creation that are on the scene.
I want to use progess bar for level creation.

How can I create GameObjects Async?

How can I see progress of Scene Creation?

You can subscribe to the SceneManager.sceneLoaded event to get notified when the scene has loaded.