Long loading time with white screen

Hey guys !

I’d like to improve the loading time of my game on mobile devices but here’s the problem :
On build, after the splash screen animation is done, the screen remains white for a few seconds before loading the scene. My guess is that the splash screen animation (3 sec) is over and unity remains in splash screen mode until the first scene is launched.
My problem is that I have tested with a blank scene and my classic scene, and even with a blank scene the screen remains white for a few seconds so I have the feeling it’s not that much about what’s inside the scene being loaded.

Just to be clear, this problem only occurs on a mobile build, not when you run it in the editor or maybe on a windows build?

Well the splash screen does not happen in editor but it takes a bit of time between when I press play and the game actually runs.