Apps - update necessary to update on the computer?

Update of applications through iTunes on my Windows Vista PC is incredibly slow.  I have been updating of applications on the computer and on my devices (iPhone and iPad 6plus 4 on IOS 9.1.3, iPhone 4 on IOS 7.1.2) update directly to a device seems to be faster.  Constanting update applications directly on the computer and each device seems an unnecessary duplication of effort.

Is it necessary to update the applications on the computer?  If applications on devices are maintained directly on the devices, only applications on the computer updated when I do a sync?

However, I guess if I have only updated the applications on the computer, applications on the devices would probably be updated when I synced and it would save me download the upgraded several times (for each device separately) applications.  However, the update via iTunes on the computer is so slow, I think I still prefer making updates directly to each device, even if it's multiple downloads.

Any ideas or advice would be much appreciated.

Here's the breakdown.

1. the new iOS supports "App thinning."

When you download directly from a device while resources (size images, screen resolutions,...) which are used on this device are downloaded.

The application downloaded for example on an iPhone 5 has no resources for other Apple devices (iPhone 6, iPhone 6, with mini iPad, iPad...)

One of the reasons for the download is faster because it is smaller

2. applications using the computer to download iTunes have all the necessary resources for all the supported devices when you synchronize.

It is also a backup in case the developer pulled the app on the app store then you will not be able to re - download from the app store.

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