Adding additional Listener ports

It has been suggested to me that adding additional Listener ports to /etc/services and corresponding aliases to sqlhosts may provide a performance gain by spreading user connectivity between the multiple listener ports. We run 7.31.UC5 on HPUX11 and all connections via tcp. We do not use shared memory connections because we are utilising HP Shmem_magic to address additional shared memory. I don't recall ever seeing anyone suggest multiple listener ports as a tuning option so I'd be interested to hear your thoughts. Thanks Gary C http://www.zfree.co.nz