It has gotten so annoying time consuming to somehow finally get into the main menu that watching at least three Netflix episodes of The Witcher before finally hearing the flight sim main menu music in the background (at the end of episode 4), has become “normal” 
Ok this was maybe a little bit too sarcastic, but the waiting time is really so annoying that I have begun watching YouTube videos while the flight sim is loading, it takes sometimes five or even ten minutes till being on the runway whenever launching the sim.
If I could improve one thing in the flight sim: It should go into the main menu like every other game or program - in about five to ten seconds 