Alfred Perlstein suggested the following mount options, and they work great:
nfsv3,intr,rdirplus,-r=32768,-w=32768
If you've got a real busy network, adding tcp to that list will help your performance, but udp on a clean switched network performs better. Man mount_nfs for more information
For example:
mount -t nfs -o nfsv3,tcp,intr,rdirplus,-r=32768,-w=32768 server_name:/freebsd/misc /mnt
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