Slow copy from Vista to Domain Controller Windows 2000 server

When I copy files from the Windows Vista clients to my Wondows 2000

server domain controller the copy/move is very slow. I order to copy a

15MB file I wait 23 seconds (21 seconds for "calculating time

ramaining..." and 2 seconds for the copy).

If I copy the same file on another Windows 2000/2003 server (non

domain controller) or a linux/samba share wait only 2 seconds.

On Domain Controller I don't have network errors (netstat -e).

I have read this KB article http://support.microsoft.com/kb/321169

and this http://support.microsoft.com/kb/321098/

Thanks

Ale