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Can you be a little more specific? Are you talking about tf or tf2? C++ or Python interface? Or the command line tool? In any case there isn't really a default publishing frequency. Static transforms use a latched topic (in tf2, at least) and for normal transforms the publish frequency is controlled by how often you actually send a transform. I suggest you read through the tf2 tutorials, they are quite informative. The static_transform_publisher of the (deprecated) tf package does allow you to specify a publishing frequency, but tf2 is the recommended package.

Hope that helps