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AMCL publishing to tf at >1 kHz certainly is not normal behavior and doesn´t make a lot of sense. Can you update your question with information on how you make it publish so fast? Such a high tf rate does not necessarily break anything, but it will cause higher CPU consumption due to the many messages that are sent around (and subscribed) on the /tf topic. This higher CPU consumption could lead to problems when maxing out the machine running the system.