When we copy files from one drive or system to another across our network the speed is often terrible, eg:10mb of files can take 20 minutes. If I reboot the system I am using the problem goes for about 15 minutes and then returns. If I transfer the same 10mb of files but as a ZIP file, it takes only a couple of seconds. The problem is not specific to one client machine.
In terms of servers we have enough firepower to run 1000 people (but it currently services only 10 people), mail and file/print are on seperate dedicated servers.I simply can't see a reason for speed problems.
I can't quite figure this out and would be grateful of a few pointers as to where the problem may lay.