NFS Server Performance and Tuning Guide for Sun Hardware
Balancing NFS Server Workload  All NFS processing takes place
inside the operating system kernel at a higher priority than
user-level tasks.  Note -  Do not combine databases or time-
shared loads on an NFS server because when the NFS load is high
any additional tasks performed by an NFS server will run slowly.
Non-interactive workloads such as mail delivery and printing,
excluding the SPARCprinter (not supported in the Solaris 2.6 and
later releases of the Solaris operating environment) or other
Sun printers based on the NeWSprintTM software are good
candidates for using the server for dual purpose (such as NFS
and other tasks). If you have spare CPU power and a light NFS
load, then interactive work will run normally.