[Samba] samba hold-up

[Seitan end Yvl]

Hello lists,
I have a problem while browsing samba shares.
When you try enter any shared directory, client waits for about 5-6
seconds, before showing contents.
This occurs only the first time you enter shares.
It doesn't matter if directory has files in it or is empty.
Maybe samba performs some ident or reverse lookups?
PC IP 3.0Ghz, 512MB RAM
OS Debian Linux
Samba 3.0.14a
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Seitan end Yvl