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Perhaps your issue is nodelet related? I'm new to nodelets and point clouds, but my understanding is that serialization performance on point clouds is so horrible you shouln't even attempt using them except between nodelets. And furthermore, several of the ros tools to not work well with nodelets. i.e. I do not see connections between nodes and nodelets in rqt_graph in indigo. So perhaps a nodelet-related bug in rostopic hz? Try to reproduce on a minimal example?

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