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Re:Uninstalling Facebook app saves up to 15% of iPhone batte... by roddux on Monday February 08, 2016 @10:10AM (#11058475)
I'd hazard a guess that part of the reason is about storing multiple copies of textures at different resolutions. At least, I think it works that way on the Apple store.
Re:Uninstalling Facebook app saves up to 15% of iPhone batte... by ksec on Monday February 08, 2016 @10:32AM (#11058614)
That is no longer the case since iOS 9 I think. Unless they didn't update / use the new App Thinning function.

But even if they get 30% reduction promised by App Thinning, they are still HUGE!.

Re:Uninstalling Facebook app saves up to 15% of iPhone batte... by fractalwrench on Tuesday February 09, 2016 @04:23AM (#11064149)
This also applies on Android, supporting most modern devices requires 4 different sets of assets, which have all got larger as screen density has increased.