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Two processes communicating directly on a system remote to Roscore

I have a remote system that is running two processes, basically a talker and a listener. These are running on a system that is connected via wifi to a desktop computer running roscore.The goal is to reduce the latency between the talker sending data and listener receiving the data. Roscore needs to run on the desktop because there are several other remote nodes to communicate with. My assumption is that the talker is sending the data back to the desktop running roscore, via wifi, and then coming back to the listener node, again via wifi, which introduces alot of latency. My question is how to ensure that the talker and listener are communicating as quickly as possible.