How I can run start function before showing scene?

I need to load a few things from my server and add them to scene. But when I click from the main scene to another scene where I need to load user info and show them. Now it first show my default text where read something like “searching…” and after less than second it shows username and other information. It looks awful because user cant read what there read first and then it suddenly change texts. How can I update texts and images (profile picture) before it shows scene to the user?

Make a fade effect?