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I think this is a Russell Christopher type of question. I don't know the answer but it's a good one.
Sorry for the delayed response, I missed this reply. Thanks for checking in. This issue has come up again recently and help would be greatly appreciated.
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Hey Jennifer -
To get the level of guidance you're looking for, someone from the product team who "owns" client-side rendering may need to comment. I'll take a stab at this, but you may end up needing to create a support case as a mechanism to try and track down someone who can get you an answer - either that, or ping your Account Manager directly and have him/her bird dog this for you.
Anyway, when you do client side rendering, Tableau Server sends the browser both the data to be rendered (in JSON format, if I recall) as well as rendering instructions. The browser does it's thing, and also can re-render certain parts of the viz very quickly because the data necessary to render the viz is still essentially right there - so there doesn't need to be a call-back to the server each time the user hovers over something, etc.
I don't know what the (local) cache settings on these payloads are, but it wouldn't make that much sense to keep them around long since they frankly won't be very useful after a few minutes anyway. In fact, when I look at the cache-settings for the response that is sent back from Tableau, it looks like nothing gets cached:
So while I don't KNOW for sure I'd guess that they just expire naturally and disappear relatively quickly. I'd also think that trying to encourage / force this process would make your users unhappy - because now you're essentially forcing Tableau into round trips to retrieve stuff it already had locally if you had just "left it alone".
Hope that helps!