Bug while starting from Windos autoload.

I can assure you that your program is not alone, you are not alone in your misconceptions (this is how software development has developed), in the context discussed: "Skype", "Discord", "Battle Net Loader" — all these programs have defects at startup: the login window is shown when starting from startup, some of them show their main window when startup. You need a program startup parameter: for example, "- autoloading" to run the command from the Windows registry like this: "%discord_path\discord.exe -autoloading".

Hanging for ten seconds with an underused interface when booting from an SSD and looking like this to the user can not be the right behavior. Of course, I have ten programs in startup, but most of them immediately go to the tray. And some, like yours, such as "Battle Net" from Blizzard, start in full screen. I know that fixing this error is very difficult, so I don't expect you to be able to. In the mentioned Blizzard program, at least there is a switch for the task to start immediately in the tray. I mentioned them because they are also scammers, like everyone else: the bigger the project, the more mistakes it has and they are already too difficult to fix.

You must run the program minimized, without an empty program window appearing on the screen for 10 seconds.

When you start the program, no Windows should appear on the screen in Windows 10. The program should only appear in the taskbar and system area. It is possible that it should not appear in the taskbar at startup either.
Pardon for machine translation in MSDN.