Google search for "man named" turns up:
https://ftp.isc.org/isc/bind9/cur/9.9/doc/arm/man.named.html
which says (among more details):
named [-4] [-6] [-c config-file] [-d debug-level] [-E engine-name] [-f]
[-g] [-M option] [-m flag] [-n #cpus] [-p port] [-s] [-S #max-socks]
[-t
Could it be that you're network limited?
In any case, the values of the following parameters may be illuminating
(they may be obtained via "rndc status").
CPUs found
worker threads
UDP listeners per interface
For example, my very lightly loaded authoritative server reports:
version:
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