IS it possible to load the whole game (and all scenes) at startup to avoid scene change delay?

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C#

Unity3D

I have a 3D game based on unity and I have made it in a way that all menu screens are different scenes, But loading takes time, and that makes it look like the game is lagging upon pressing a button. Is there any way to make the whole game and all scenes load at start-up and just show themselves when called? here's the code I tried:

<pre lang="c#"> if (Application.GetStreamProgressForLevel(1) == 1 && Application.GetStreamProgressForLevel(2) ==1){ Application.LoadLevelAdditive(1);
Application.LoadLevelAdditive(2);
Application.LoadLevel(1);