Same as me.

So I checked things more carefully today. I think it is in fact taking a long time to read all the files on car start. However, I never bother using the by artist, album etc. I just browse the directory to play albums one at a time (maybe you use playlists?). Anyway, you can browse the directories immediately and also it will continue from where it left off very quickly.

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1995 BMW M3 (Track prepared)
2006 BMW 530xi (Wife)
2011 BMW X5 35d (Tow/Daily)