-Dcom.ibm.CORBA.ConnectionMultiplicity

This system property sets the number of concurrent connections to the server endpoint (target host-port).

-Dcom.ibm.CORBA.ConnectionMultiplicity=<n>
Where <n> is in the range 0 - 2147483647. Setting this value to a number <n> greater than one causes a client ORB to multiplex communications to each server ORB. There can be no more than <n> concurrent sockets to each server ORB at any one time. This value might increase throughput under certain circumstances, particularly when a long-running, multithreaded process is acting as a client.
If this property is not set, autonomic connection management is turned on and the ORB automatically manages the number of concurrent connections to the server endpoint (target host-port).

Read the following article for best practices on tuning this property: https://www.ibm.com/support/docview.wss?uid=swg21669697