Beginning Collection Views - Part 9: Cell | Ray Wenderlich

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In this video tutorial we’ll look at the Cell-Prefetching feature introduced in iOS 10, which can improve the scrolling performance of your collection views.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3819-beginning-collection-views/lessons/9
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After some tests, I found only using the cellForItemAt is more efficient than the prefetchItemsAt method to display these photos. Even when using photos from the network, we still can utilize the imageCache mechanism to improve display efficiency. So, Why should we need to use this new method?