Question about LaunchScreen

I have a couple og questions to technicians guys / ue stuff…
about the first stage of the boot package. (LaunchScreen)

  1. What really happen at that stage? Loading of uengine’s binary code only?
    Exactly what is loading step by step?
    For example i pack clean project and run it on iOS and i have SplashScreen at first 5-10 seconds.
    Are there ways to speed up the boot process?

  2. Is it possible to customize LaunchScreen like animated logo with audio ? (I mean not after SplashScreen passed)
    (xib)

Thanks.

// macOS/ue4.12