Windows XP was not initially meant for gigabit speeds. A few registry changes (assuming you do have a gigabit connection) may improve your sustained transfer rate.
[Note: These are only possibilities to try - be prepared to restore to original settings.]
TcpWindowSize
HKEY_LOCAL_MACHINESYSTEM | CurrentControlSet | Services | Tcpip | Parameter
Create a DWORD value, name it TcpWindowSize and set it to 1048576 decimal
The value is definitive. We suggest trying different values as long as the transfer is stable.
DefaultSendWindow
Another registry item to change is:
HKEY_LOCAL_MACHINESYSTEM | CurrentControlSet | AFD | Parameters
Create a DWORD value, name it DefaultSendWindow and set it to 1048576 decimal
TCP Automatic Scaling
HKEY_LOCAL_MACHINESYSTEM | CurrentControlSet | Services | Tcpip | Parameter
Add a DWORD value, name it ‘Tcp1323Opts’, set value to 1
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