I keep getting lockups and hanging delays with my NFS setup, so I continue to experiment.

Server /etc/exports:

/var/www  *(rw,sync,fsid=0,no_acl,insecure,insecure_locks,no_subtree_check,no_root_squash)

Client /etc/fstab:

192.168.8.91:/dev/ /mnt/imports/dev-91-gl  nfs4    rsize=1024,wsize=1024,hard,rw,timeo=4,intr,proto=udp 0 0

¥