SBS with BeagleBoneBlack

hello All,

I recently replaced a tower pc with a BeagleBoneBlack, using a 3.5" inch USB drive as music library.

Logitech Media Server Version: 7.9.0 - 1470553729 @ Sun Aug 7 07:46:23 UTC 2016
Operating system: Debian - EN - utf8
Platform Architecture: armv7l-linux
Perl Version: 5.20.2 - arm-linux-gnueabihf-thread-multi-64int
Audio::Scan: 0.95
Database Version: DBD::SQLite 1.34_01 (sqlite 3.7.7.1)
Total Players Recognized: 3

It works fine with radio streaming, but have what looks a rebuffering issue with my FLAC music library: it is impossible to use due to the frequent stops.
Also, the web interface loads very slowly.
No useful info in /var/log/squeezeboxserver.

I checked CPU and MEM with top, but it's ok, so I wonder if the USB interface to the disk is the problem:

sudo hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 332 MB in 2.00 seconds = 166.02 MB/sec
Timing buffered disk reads: 28 MB in 3.20 seconds = 8.74 MB/sec

Does these figures look good enough for a SBS server, or are too slow?

Thanks for your advice,

-Gian