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http://camel.465427.n5.nabble.com/fyi-SI-tp5716049.html
We should log at INFO (maybe even WARN level) if shared reply queues are in use as they are not as fast. They have their purposes though, such as a shared clustered queue, or if a queue is used by other apps too (not ideally thought).
Temporary and Exclusive reply queues are faster.
See the JMS docs at the request reply section, for much more details.