Use Application.LoadLevel or have the entire game as one scene?

Hello, I am developing a puzzle game (Mobile) with about 100 levels. Presently I have made a nested prefab system and a level manager for loading levels. Now the pros and cons are: Pros: No loading or unloading of assets during gameplay. Cons: Long loading times when the game is launched for the first time (~8 seconds)

Now, is there a better way to do this rather than loading everything at beginning?