samba - Aug 2012 - User profile service hangs, very slow logon after profile migration

Hi,

The DC is a Samba 3.4.5 on OpenBSD. After a migration from Windows 2003 
server with XP clients to 2008r2 server with Win7Pro clients the logon 
procedure hangs for at least 30 secs up to 30min with the message "User 
profile service ..." on every machine regardless if they logon on a 
local computer on the domain or to a terminalserver (win2008r2).

Now, for testing purposes I created a new profile and voil?: This runs 
smoothly and fast. The logon is under 2 seconds.

I compared this with a profile which was migrated and clearly has to 
entry on the samba server: <username>/ and <username>.V2/
My new profile only exists as: <mynewprofile>.V2/

Both are around the same size (20mb), the network connection is a stable 
100mbit ethernet wiring, the load of the samba server is negligible etc. 
So no bottleneck here so far.

Is it possible that the migrated profiles are the source of the 
slowness? Is there any other solution than deleting and re-creating all 
profiles?

thank you for your help
Mathias

I found a "solution" which solves my problem:

Start on the client gpedit.msc

Set maximum wait time for the network if a user has a roaming user
profile or remote home folder setting and configure Wait for network for
maximum option is 0 seconds under Computer
Configuration\Policies\Administrative Templates\System\User Profiles.

Activate Do not detect slow network connections under Computer 
Configuration\Administrative Templates\System\Logon

This fixed my issue, the logon now takes roughly between 3-45 seconds 
depending on how much data is storred in the roaming profile.

Regards,
Mathias