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dynamic_reconfigure is intended for parameters that change occasionally; not for continuous parameter updates.

You probably shouldn't be trying to transfer parameters from one node to another at a high rate using dynamic_reconfigure. Why not use topics instead?

(as a side note, the trailing & on your command will cause it to run as a background task. It will still take just as long, but it won't block your main thread, and if you call it frequently you will end up with lots of background tasks, all running at the same time. This is probably why you're seeing high CPU usage.)