To configure whether Windows Explorer should register for events happening on the mapped network share:
Windows XP and Windows 2003 extends the event registering from just being the root-folder, to actually be all underlying sub-folders and their files (Even more traffic). To change this back to only register for events happening in the root of the mapped network share:
[HKEY_CURRENT_USER \SOFTWARE \Microsoft \Windows \CurrentVersion \Policies \Explorer]
NoRemoteChangeNotify = 1
More Info MS KB812669
Note if using software which relies on being notified of file changes and its files are placed on a mapped network share, then this change in policy might give unpredictable results.
Note only WinXP SP2+ reacts to the registry entries above, or if having applied the Critical Update - MS KB810565.
More Info MS KB831129