I presume - from your question - that you see high CPU usage *only* when you have a large number of concurrent client connections, but not if you have a small number of concurrent client connections.
If this is the case, then the problem is almost certainly caused by you running into an OS-imposed limit on the number of open files (sockets) that can be used by a single process. See http://www.live555.com/liveMedia/faq.html#scalability Ross Finlayson Live Networks, Inc. http://www.live555.com/
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