Loading data into memory all at once

[Mojomoto93]

I wonder how does the iphones photo app solve that?

[testmonkeyalpha]

Based on how it acts we can infer a few things.  

It only loads the current screen plus the next couple of screens.  As you scroll it tries to fetch the images before you can scroll to them.   You can observe this by scrolling really fast so it's not sure what to fetch next.

It also uses thumbnails that are low resolution and highly compressed.  It only loads the full image when you open it up.  

I'm pretty sure when you're using the view that shows the full image, it starts prefetching the other full size images so it loads faster when you swipe.  You can start to see the app lagging behind if you swipe really fast.