Slow network browsing to NetApp SAN (help)

Hey folks,
I have two location seperated by a WAN link (1Gb).  I have a couple Mac's at the main location and a couple at the alternate location.  The Windows 7 and XP boxes at the alternate location exhibit NONE of the problems that we are having with the Mac's. It's frustrating.
No matter if I am on a Windows box or a Mac at the main location I never have a problem.  At the remote site I have problems with only the Mac's.  They take sometimes two minutes or more to show the contents of a network folder.  I can put a Windows 7 machine right beside the Mac and plug it into the same switch and it has zero problems.  What gives?
I've tried everything I know.  I've followed threads on here that recommend changing a few things in the SMB.conf file.  That didn't help as I did it as well.
The Mac's are running a combination of either 10.6.8 or 10.7.x.  Both Mac OS's have problems.
I'm the network admin and I have access to all of the network/server equipment including our Cisco switches and routers.  I cannot find the problem.  I originally
If I click on "Connect to Server" and then specify the SMB path with our without port 139 specified it will come up and prompt for credentials (on the first time only) and then open up the folder.  Then I drill down through a folder or two and get to a folder that has about 4200+ pictures in the folder.  Each pic is about 4 Mb in size.  That is when it will sometimes take 2-6 minutes to get anything to show up. 
I've tried turning of generating the thumbnail preview in Finder and that didn't help either.
Any help is appreciated.
Thanks!
David (MCSE, MCP+I, Linux+)

Grant,
I work for an NFL team and they are game photos.  Believe me, we need them and we have software that can look through those photo's like it's no big deal.
Windows 7  and Windows XP have no problems loading the content of the folders.  Your answer didn't really give a solution.  And no, we are not going to go through those photos and categorize them more.  They are from one game.  Each game has that many photos.

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