My NT 4 network is slowing down Help! Small network with win98 Clients. I have install 256K ram and defraged with diskeeper and run winDoctor on all clients. Everything looks good but everything is slowing down. Main accounting application on serveris a dos based.Security is good no virus can come in. I need help in trouble shooting the network. What performance monitors to set up and what to look for. All of network is in one room. Nics are 100s. Would 1000 nic cards improve the situation. Network has been running ok in the past. Harddrive are less than 50% utilized? Back up is scheduled using NT backup. defrag is scheduled every day? How can I tell if the problem is in my RJ45 lines and hub. Hub is new. Lines are about 5 years old. 5 years ago it all ran well? NO new server apps installed since then over 5 years. SP is up to sp5. Server and Clients are never turned off. Any ideas I will try your ideas and award points for ideas that help. Thanks, Mike.