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So I just finished updating my phone from Android 6 to 7.

Before downloading the update, I had two point something GB of free internal storage space.

The update was one point something GB of size, and I expected to get about as much back after the update was concluded.

Except, I have now - even after updating all my apps - five point something GB of internal storage available ... and no, I don't think I'm missing any apps (nor personal files, since I'm in the habit of storing as much as possible [read: everything] on my external SD card).

I'm certainly not complaining, but I'm curious. What's the (most likely) data that's been deleted? Is it really possible that Android 7 is that much more efficient?

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    Runtime environment is different... Marshmallow pre-compiled applications and stored them for use, Nougat compiles on the fly as needed. Seeing a gain of a few GB is not unusual after upgrading to Nougat. – acejavelin Apr 20 '17 at 14:45
  • Thank you. That's a neat feature. Want to make an answer out of it? – User1291 Apr 20 '17 at 14:49
  • It's not really a feature, it's just different than how Marshmallow and Lollipop did it, it does have drawbacks particularly on lower end hardware. And yes, I will add an answer. – acejavelin Apr 20 '17 at 14:53
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Runtime environment is different... Marshmallow pre-compiled applications and stored them for use, Nougat compiles on the fly as needed using a JIT (Just In Time) method. Seeing a gain of a few GB is not unusual after upgrading to Nougat.

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