What the Wiki says described how MC 18 behaved, but to my very pleasant surprise, MC 19 has played music from my NAS flawlessly. I thought it might have to do with its memory management.
No, I just wrote that a few weeks ago. It is absolutely accurate for MC19.
I think you are confusing the storage of media files with the storage of the library, becuase you haven't been able to set up your library on the NAS so how come you're now saying it's workedflawalessly?
Right. The "Library" has nothing to do with the place where the media files are stored. It refers only to the database MC uses as the back-end. Read the Wiki article again.
You absolutely can store your media on a NAS.
You can, but should not, store MC's "Library" (the database) on a NAS.
One Question, i want to buy this NAS: Synology Diskstation 2413+
This is definitely not a 'slow' NAS. Fast enough to set my main library to a directory on the NAS?
All NASes are slow compared to a local disk. Even if a NAS is able to "peg" a Gigabit ethernet link, that is still limited to around 100mbps (and hardly any consumer-class NAS boxes will even come close to that). A modern SSD can do 400mbps without blinking an eye. And, those are sustained throughput figures. Random access times on a NAS will always be an order of magnitude worse than their performance when doing a sustained read (aside from perhaps very-high-end "Enterprise-grade" SAN systems). Access to the database is mostly random-access (tiny little bursts of reads and writes) while media playback cares more about sustained read throughput. Again, though, you
can put your media (music files, video files, etc) on the NAS, you should
not put your Library on the NAS (MC's database listed in the Library Manager). This is mostly due to random access performance.
Is there an exception to this rule of thumb in the event that the NAS acts as a DLNA server?
http://wiki.jriver.com/index.php/DLNA#Using_DLNA_--_Finding_DLNA_Renderers_and_Servers
What MrC said. That's not relevant. The DLNA server is a
server, and works through an entirely different mechanism.