There is an issue with slow copying (specifically writing) and xServes, as well as xServe RAID configurations.
Linda Plessett writes "Has anyone commented on the recent Mac OS X updaters (since December), that they have noticed files take much longer to copy to the Xserve? For example, it took several hours to copy 1 gig to server, when last November that may have taken only 5-10 minutes."
The general consensus is that this problem is caused by either the security update Apple released on December 19th, or the Mac OS X 10.3.2 update. The only known workaround for users who need to use AppleTalk is to downgrade to Mac OS X 10.3.0 (virgin from the install CD) or Mac OS X 10.2.8 and refrain from installing the 12-19-03 Security Update.
For users who do not need AFP AppleTak access, some users have suggested switching to an SMB share by changing the server connection string from 'afp:/at/server' to 'smb://IP address.'