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Android team had provided optional choice of Dalvik or ART system with Kitkat. Only a select few delve this deep to explore such features. Personally one of the choicest feature for me which I had wished since much before was improvement in app update process. I use both android & iOS. Every time there is an update I have to download the whole app size again. I had wondered why they can't make them supplement updates like in desktop OS. It was said that with the next iteration of android aka 5.0 ART will replace dalvik which will come with many such significant changes. Interestingly iOS has not been able to tap this practical solution owing to their APIs I suppose till iOS 7.2 at least. I haven't checked iOS 8 yet. But in kitkat 4.4.4 I have constantly monitored that whenever you update an app. Even though it may show full app size when download begins and starts downloading but half through 45-55% it starts installing the update. I have even confirmed it with my exact data usage for that particular session. Finally & thankfully they have improved app update process. It saves time & data to a great extent. When we are using wifi we don't bother with such things. Some of us click update all, some choose certain apps to update, while others just ignore these notifications. But it matters and most of all its smart & practical. Now a days mobile apps sizes have increased exponentially unlike initial days. Of course so has the quality and features. I am traveling so much and certain changes in updates demand immediate attention. I end up doing that on mobile data. This change has become a saving grace in many aspects. If you have already observed this or are now noticing it, please share your experience and views.