Help with s-l-o-w-w-w-w-w  Windows file sharing

After much hair-pulling, I finally got windows file sharing working on our 10.4.4 xserve (opening up ports 137-139 helped a lot!) - however I have noticed that directory navigation from the PC's are extremely slow... it takes about 25-30 seconds to navigate from one dir to another... once you navigate into a dir, and then back out, it seems that the next attempt into that same dir is very fast.
Any tips are appreciated.
Windows PC's are running XP Pro SP2.

There are several threads about improving Windows performance over smb. Do a search for "smb slow" to find them.
The single biggest thing you can do if you're dealing with a lot of little files is to do: sudo sysctl -w net.inet.tcp.delayed_ack=0
To add this permanently to your server add 'net.inet.tcp.delayed_ack=0' to /etc/sysctl.conf
There a bunch of other edits discussed here:
http://www.macosxhints.com/article.php?story=20040201121437157
=Tod

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