Symptoms
1) When copying some small files from a w2k/xp computer to a network share on a 2000 domain controller, network performance is slower than if you copy the same files to a member server. However, you may not have this issue when copying a few large files.
2) This problem only occurs if you either use Windows Explorer to copy the files or if a Windows Explorer window is open and connected to the target server. However, if you use Xcopy.exe to copy the files and all of the Explorer windows are closed, you do not experience this issue.
Resolutions
On the domain controller, you can edit the TcpDelAckTicks registry value to adjust the TCP delayed ACK timer.