Hi Patrick Turner,
I'm raising this thread in hope of an user being able to provide you with some tricks.
If you need a solution rapidly, I would consider creating a ticket to our customer support: Support Case | Tableau Software
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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While you can't pull that performance log from the ipad immediately and send it over, you could have the user email support with a time and dashboard name which you can then use to track performance in the postgres.