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OS10.6.3 connection to Window shares is really slow

We have about 50 or so Apple OS10.6.3 machines connecting to our windows shares.  Ever since we have either upgraded to snow leopard or bought a new machine with snow leopard on it, it takes forever to get in to the Windows shares.  And copy anything to them takes forever. Go to a OS10.5 it works perfect.  Anyone got any fixes/suggestions.  
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Commented:
Sorry forgot to add that we use ExtremeZIP on these files server but also have tried SMB.
Commented:
try following in terminal:
sysctl net.inet.tcp.delayed_ack
if it returns number 3 switch it off temporarily by typing:
sudo sysctl -w net.inet.tcp.delayed_ack=0

Unmount shares & remount

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