The sorting of a collection is triggered every time there's a change in the stock of a product. If the app detects that a product is sold out, the collection is sorted in real time.
However, if there are multiple inventory changes in a matter of minutes, the next sort is delayed so that it doesn't have to be processed several times in a very short period of time. The table below shows how long it takes to start another re-sort, depending on the size of the collection:
Minimal re-sorting delay
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