How many nfsd thread on Rocky 9.4 nfs server

We have setup an NFS server on Rocky 9.4. We face poor performance issues since we may have simultaneous access from 70 clients (Rocky 9.4). First thing we will change is the number of nfsd threads in nfs.conf.
What is the optimum number for nfs threads for the server? Should we based on number of clients simultaneously access the server, or on the number of cores/threads of the server CPU? The server is running with Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz, that is 8 cores, 16 threads.

Thank you

Maria

Before messing with threads, see this first
https://forums.rockylinux.org/t/nfs-clients-unresponsive-nfsiostat-hangs/15870