Really slow directory listing on network shares

Customer of mine recently purchased 2 brand new iMacs and 1 MacMini (NOT running the server OS). They also have an older iMac, running 10.6.8, on site.
Using the MacMini as network storage. Setup a few users and a few network shares. The MacMini is not used by any one.
Issue seems to be that when the iMacs browse to the shares it takes a really long time for the file listing to come up.
So here's the process from any of the iMacs:
Connect to the MacMini (afp://server)
Click on a shared folder
Wait 10-15 seconds for the files to show up.
Some of the folder may have like 2 dozen small word files in it, so I can't believe it's an overabundance of files causing the issue.
Once the folder has all it's files listed everything is normal speed. They can even copy the files at normal speed, it's just the initially populating the folder, if you will.
Slightly stumped as they use to use an ancient, underpowered, Vista machine to for the network storage and didn't report this issue.
Any thoughts would be appreciated.

This issue can be caused by a slow or incompatble DNS server on the network, especially a Windows DNS server. If the sharing clients are configured (in the Network preference pane) to query a local DNS server, change the address of the primary DNS server to something outside the network, such as the ISP's DNS. Test.

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