Marco Arment

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So for whatever it's worth, native dev should be faster. Now, the most common trick that Apple's frameworks use, and I presume other platform frameworks probably do similar things, it shouldn't matter really how many items are in a scrolling list for the list performance. The trick they usually do is, suppose on screen you can fit 10 cells.

So for whatever it's worth, native dev should be faster. Now, the most common trick that Apple's frameworks use, and I presume other platform frameworks probably do similar things, it shouldn't matter really how many items are in a scrolling list for the list performance. The trick they usually do is, suppose on screen you can fit 10 cells.

Well, as you scroll through a list of 100,000 items, it only keeps like 12 cells alive in memory. It just recycles their content. And so it has like, you know, the 10 cells that fit in the screen and it has like one above and one below. So as you partially scroll, that's already loaded. And then as you scroll the list, all it's doing is swapping in the content of those same 12 cells.

Well, as you scroll through a list of 100,000 items, it only keeps like 12 cells alive in memory. It just recycles their content. And so it has like, you know, the 10 cells that fit in the screen and it has like one above and one below. So as you partially scroll, that's already loaded. And then as you scroll the list, all it's doing is swapping in the content of those same 12 cells.

So it isn't like allocating everything. It isn't rendering the entire list. It's just rendering the part that you are looking at. So theoretically, it should be fairly linear. Like the performance of the list should be about the same no matter how many items it has. Now, there are a few things that can break that assumption.

So it isn't like allocating everything. It isn't rendering the entire list. It's just rendering the part that you are looking at. So theoretically, it should be fairly linear. Like the performance of the list should be about the same no matter how many items it has. Now, there are a few things that can break that assumption.

and require the frameworks to load all the items or to render all the cells. That can be things like if they are variable heights and you want an accurate scroll indicator of where you are in the list position, then the framework has to render every cell to know, well, how tall are all the cells? So I know how tall is the total view, so I know where to put the scroll indicator.

and require the frameworks to load all the items or to render all the cells. That can be things like if they are variable heights and you want an accurate scroll indicator of where you are in the list position, then the framework has to render every cell to know, well, how tall are all the cells? So I know how tall is the total view, so I know where to put the scroll indicator.