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ART is a good news for Android users, but it's really optimize the performance? I watched someone use Android L to run some popular social app(like WeChat), you can't open it normally. Some big bug sure be fixed.

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I am testing the L build on a Nexus 5. Our app has a feed full of very rich views. We already implement a lot of optimizations (not all of those that are possible though, namely flat custom views, simply because we don't have the engineering ressources to do it right now) but it scrolling is not perfectly smooth on 4.4. We lose a couple of frames each second when scrolling rapidly (interestingly, in addition to its native code, iOS also limits scrolling speed in order to deliver a smooth experience). This is no longer the case with Android L. Without changing anything in our code, this feed is now smooth as hell.

About the app you mentioned, L is right now a preview build, there are indeed a lot of bugs everywhere. It is not really surprising since we are months away from the release. It does not have anything to do with perfs though.

I think you are right. I'm not a pure Android developer, just do some works with Android. Your test give us a good news, we happy to see Android more smooth.

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