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I took a quick look at the code and the thread pool in question appears to be related to WebLogic's multicast cluster implementation; furthermore, it looks like it can only safely have a single thread (so adding threads is not an option). There's step-by-step cluster troubleshooting guidance in the WebLogic documentation, or, alternatively, I'd bet that reconfiguring your cluster to use "unicast" instead of "multicast" mode would take care of the log message.
That said, I think it's hard to say whether the log message is related to the lowered performance. Thread dumps, JVM profiles, and wl statistic dumps could help with diagnosis.
I agree with u but I would say, user has to chek MaxThread Constraint in server as well, Summary of Deployments > <application Ejb or wahtever>Monitoring>Workload to what size has defined
But of course bottom line need to collect Thread Dump, Logs etc to analyze completely to get the root cause.