Mac painfully slow over mixed network SMB/CIFS

I am using a Mac mini over a mixed office network. Several network operations are painfully slow. I posted a previous topic when I was using my G5 over the same network. Nothing has been resolved. G5, Mac mini or any Mac are slow over the network.
-photo previews take at least 2 minutes each to view while on a PC the whole drive of previews are instantly seen.
- Entourage common network calendar takes 5-10 minutes to view/update while the same common calender on a PC takes a few short seconds.
- Browsing folders on network drives is slow.
- Transfering files is slow
Basically any work done over the network from the Mac is tediously slow. Burning CD's and hand carry the files to other offices would be faster. The PC's instead all work fine over the network.

This looks very interesting and worth looking into. I've got the info in the hands of our net administrator.
I am making progress. I switched the mac mini from ethernet to airport. That has helped dramatically. A folder of 175 mb that was going to take hours and hours to copy to my local drive (I finally gave up) only took about 2-3 minutes over wireless. Previews of photos now happen in a few short seconds. The Entourage common calendar still takes a while to upload but that's probably an Entourage issue.
Our network administrator is going to string new cable to my office and we'll check the switching as well.
Thanks everyone for your continued help as we solve this issue and rescue the Mac's reputation in a windows environment.
This sounds alot like a duplexing issue, whereby
your macs are connecting eventually to a switch, that
isn't properly auto-negotiating your ethernet speed.
You can try going into the Network preferences and
forcing your mac to either 100 full duplex or 100
half duplex and do some testing. Some Bay
Network and Cisco switches must be set (if they are
managed switches) for fastpath operation where they
will autonegotiate better with equipment like our
Broadcom manufactured network interface cards. I
had the same issue at home with a Netgear switch, I
replaced it with a Dell gigabit switch and the
problem went away.
Power Mac G5 Dual 2Ghz/iBook G4
1.42Ghz   Mac OS X (10.4.8)   2.5 Gig, Rad
9800 Pro 256M

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