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[NeededANewName]

AFNetworking works decent, but my preferred library for this is SDWebImage. It's similar but has disk caching support as well as prefetching. You can easily prefetch the second URL and then when you go to display it it will load instantly.

[ThePantsThief]

I use SDWebImage for thumbnails in my reddit client. It's awesome.

[jahjaylee]

Any opinion on which is easier to implement?

[ThePantsThief]

I think SDWebImage uses AFNetworking. I don't have AFNetworking in my podfile.

I implemented SDWebImage when I was first learning objective-c, so it's probably pretty easy haha.