Haven't used it, so could be wrong, but fairly certain this has nothing to do with the network. This is basically a "terrain chunking" application that loads chunks of the level at a time.

Gotcha on the "postal service". That's what a server should be like. And 3DGS is as robust for a MMOG as any other engine... it's also just as difficult as any other engine. Pros and Cons, Pros and Cons.