So what’s with the long delay loading old messages when scrolling back in my history?Good call. I hadn't really considered that.
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Not sure, but you might be thinking of the newer app offloading feature that deletes unused apps, but keeps their preferences and data in place in case you decide to use them later. It kind of does the inverse of purging app data: it purges the app itself, leaving its data and preferences in place so that you can re-install it without reconfiguring everything.