For those of you who use NFS (the Network File System) under OS X for file sharing, here is a hint from MacOS X Hints that describes how to improve performance.

The key is an old unix trick of doubling the number of NFS daemons running on the machine in order to get more simultaneous I/O going.

Basically, replacing the 'nfsiod -n 4' with an 'nfsiod -n 8' in order to double them.