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DFS Access is slow and becomes unresponsive

We are running DFS on our Windows 2008 R2 Servers and are experiencing high latency when accessing the share (\\domain.com\share); however, if we access the share via UNC (\\servername.domain.com\share) everything is fine and very responsive.

This occurs if we are replicating the share or not.

The overwhelming majority of our users are Windows XP SP3, with few exceptions.  

I have read articles that state the issue is related on numerous queries being sent and the driving problem was NetBIOS, is this the case?  We do have a WINS server that is included in each DHCP scope, should this be removed thus forcing a pure DNS look-up?  I know that WINS is not necessary for any OS above 2000 and is not recommended in an AD environment but could this be the underlying problem?
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Sarang Tinguria
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I have checked that each DNS server was pointing to itself and that forwarders were set to the correct external DNS server; additionally, I flush and registered each DNS server.

I stopped and restarted the DNS and NETLOGON services.

I looked through the event logs and there was nothing strange there either.

I removed the WINS information from each of the scopes a few days ago.  No PC currently has a WIN setting...

The DFS Share latency is still present...  Any further suggestions?

Many Thanks