It is almost unfair to call Synology`s DiskStation DS212 a NAS server. It is capable of so much more than simply providing network attached storage, that a different classification should be established. Sure, it does a great job as a NAS, but owning one simply to serve files on a network would be like buying a really nice Swiss Army knife just for the tooth pick."
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips