Very slow speeds with Mac Pro talking to a Ubuntu Raid Server

So I have an environment where mainly macs and a couple Windows PCs use a Ubuntu Raid 50 file server. When attempting to access the server the Mac Pros take typically 1 minute to view the file structure and sometimes timeout, the Windows machines take about 1 second. Also this seems to affect copying and deleting which takes much longer from the Mac side. The server is setup simply with a samba mount to allow access.
Any suggestions for how I can attack this issue? Any help would be greatly appreciated.
Colin

Nope. The Macs and PCs are on the same subnet and plugged into the same switch, from the wall.

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    WLAN IPv6 ACL.................................... unconfigured
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