Windows 2000 I/O Problem

I have setup a dual-boot computer with Win98SE and Win2K Pro w/SP1 on an NT 4.0/SP4 network.
Everything works fine except there is an enormous difference in the time it takes to copy files from the server(s) to the workstation.

Example: In Win98SE, it takes about 20 seconds to copy an 8 MB set of folders to the workstation from the server.
In Win2K Pro, it takes well over 3 minutes to copy the same set of folders to the workstation.

I have setup another computer with Win2K Pro w/SP1 only, and it has the same problem.

Has anyone else experienced this problem

Is there a tweak in Win2K Pro to solve this problem?