We had performance issues on our NFS servers, very poor performances.
after analyze we have seen that the bottleneck came from the disks, as always;
but tuning the FS did not solve the problem.
I talk about 1500 NFS mountpoint (running on 9 nodes from ServiceGuard cluster solution) as in my actual mission, everything works through NFS.
The homedir of course but also the applications, the logs, libraries etc…