We have a Windows 2003 file server on which we store all of our drawings. We map drives to this server in two ways: as a standard share and via DFS. We are using primarily AutoCAD 2002 network clients (transitioning to 2005 which exhibits similar behavior). The problem we are seeing is that users throughout the building occasionally experience hesitations in AutoCAD. They all experience it at the same time. The lag last 5-20 seconds and then clears up. Most people describe the phenomenom as crosshairs freezing. It happens several times a day during their normal workflow. My IT guys have checked the NICs against the switches to ensure that the throughput speeds match. We've added a RAID controller to the server itself. We haven't found the bottleneck yet. I have one network folder in the users search path for office customization. I've tried removing this path and it doesn't make any difference. I've tried running everything local and the problem goes away. Obviously I must be able to access, and edit drawings on the server. Most of our workstations have a Windows 2000 OS, though some are XP. We are running McAfee anti-virus. We are running Outlook 2003. Sometimes CAD users will tab over to other applications, like Explorer, and notice the lag there as well, which makes me as a CAD Manager point to the network. But non-CAD users don't seem to have this hesitation, freeze up problem (at least I've heard no complaints.) I've seen other posts that seem very much like this, but have not seen anyone who's found a successful resolution.