You might want to check your TCP connection. Sometimes if the windows network settings aren't quite right, slowdowns can result. Try pinging the other computer to see if there is any great delay. You might also try communicating with Hyperterminal. If things check out there, try using the IP address with dot notation in LabVIEW so that there is no DNS slowdown. Also, go into the VI Server options. Under TCP Access, try putting an asterisk "*" in the allow list and dissable strict checking.