Hoping this is a good thread to ask this question; couldn't find it easily in the 107 pages of the thread (it's probably in here somewhere):
When does the (MCU1, fwiw) build the music index? On my newly-inserted USB stick (128GB stick w/~115GB of MP3-only files), I sometimes can go straight to USB and see the music, other times it seems to have started rebuilding the index when the car turns on. I'm on 48.12.1.
I was having some trouble with a sluggish display, and figured it was the eMMC. Tesla did remote diagnostics and told me my USB stick was causing problems, so I went for a couple of weeks without it. Sure enough, most all of the display sluggish-ness went away.
So I bought a new stick, put all my music on it, and plugged it in. I haven't really noticed much sluggishness in the display lately, but about 1 / 5 times I go to play USB music, I find it reindexing. Isn't it supposed to index once and save it until the stick is removed and plugged back in?