Yes - trying to save/access the files over the network is going to be slow, plus what happens if there's a problem with the network connection? Does it need to be 2-way synchronisation?
You definitely want to think about writing to the files locally and then transferring them to the network as a seperate action.
Something we've done before is to write the files locally into a folder and then periodically scan the contents of the folder and transfer the files via FTP to a server.