Max effective number of CPUs that Postgresql can handle?

[Ron Johnson]

PG 9.6.24 on an ESX VM with nproc=32 and RAM=132GB (We'll be on 14.latest
hopefully by February.)

Like the Subject says, is there any point of diminishing returns at which
the Postmaster gets "too busy" to manage all the threads?

(I'm not in control of the stack's architecture, so "change
_insert_topic_here_" -- including connection pooling -- is not in the
cards.)

Thanks