w2k on nt4.0 network

Hi,
I’m in a winnt4.0 environment. With 95,98 and a few nt clients. I recently connected a few win2000 prof. computers on the network. I noticed that the win2k clients are very slow accessing files across the network. Is there anything that couldbe done to speed up the win2k clients on a winnt4.0 network?