Slow logon at a domaincontroller console

Our domain controllers are all 2003. When logging on to the console (or by Remote Desktop) of a domain controller, it can take several minutes (even 10min) before the start button apprears after typing in username and password. It seems that the slow down is because of drive mappings that the site gpo is trying to do (mapping to itself) which it isn’t really happy with. It eventually runs all scripts but takes a long time to log on. Any ideas? Any way to cause the site GPO to not run when logging on to the DC itself?