First you may want to give LAN Speed Test a try to make sure your speeds to the server are decent. You can use \\servername\Amazing Charts and use 2000 packets. Another trick is if the speed seems slow, from the same computer you could try \\ajgodbolepc\users\ and see what its speed is. If it is much faster, could be something on the server.
Are you using a lot of the checking stuff on the script writers? I know if you were, it was still probably much faster. But, that's one of the few things that is Internet dependent. I don't do any of them. Try turning them off.
Of course, there is the wireless issue, although the wired does the same.
Maybe it is I, but I tend to immediately think these things are my network issue. One good test is to run one computer directly to the server. And, you can remove the update.
