Samba PDC without roaming profiles

To disable roaming profiles so that client pc's don't take a long time to login & logoff on a Samba PDC network:

Start/Run/gpedit.msc
Local Computer Policy/Computer Configuration/Administrative Templates/System/User Profiles

Enable both the "Prevent Roaming Profile changes from propagating to the server" setting and the "Only allow local user profiles" setting.

Note: If enabled, user profiles won't be copied to the Samba PDC server.