I think I figured out part of the problem. In OSX (mac), there is a hidden file placed adjacent to every file. It's called an "apple double" file that's hidden with a ._ as a prefix to the file name. I used a utility to "clean" the USB drive and this has increased the speed of the USB drive. Takes about 8 seconds to pull up my artists (previously, it was 30 seconds).
On a side note, I have a loaner 5 series with the NBT nav. The list comes up instantly. Gotta love the increased processing power of the NBT infotainment system compared to CIC (we have CIC in our 13-15 X1s).
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