Android vs iOS – fascinating… now I’m starting to wonder if I’m ok with a little lag

Dec 06 2011

android vs apple Android vs iOS   fascinating... now Im starting to wonder if Im ok with a little lag

I was never all that annoyed by the slight lag in the android ui, but this explains whats going on… and now I’m thinking maybe its a decent tradeoff…

It’s not GC pauses. It’s not because Android runs bytecode and iOS runs native code. It’s because on iOS all UI rendering occurs in a dedicated UI thread with real-time priority. On the other hand, Android follows the traditional PC model of rendering occurring on the main thread with normal priority.This is a not an abstract or academic difference. You can see it for yourself. Grab your closest iPad or iPhone and open Safari. Start loading a complex web page like Facebook. Half way through loading, put your finger on the screen and move it around. All rendering instantly stops. The website will literally never load until you remove your finger. This is because the UI thread is intercepting all events and rendering the UI at real-time priority.If you repeat this exercise on Android, you’ll notice that the browser will attempt to both animate the page and render the HTML, and do an ‘ok’ job at both. On Android, this a case where an efficient dual core processor really helps, which is why the Galaxy S II is famous for its smoothness.On iOS when an app is installing from the app store and you put your finger on the screen, the installation instantly pauses until all rendering is finished. Android tries to do both at the same priority, so the frame rate suffers. Once you notice this happening, you’ll see it everywhere on an Android phone. Why is scrolling in the Movies app slow? Because movie cover thumbnails are dynamically added to the movie list as you scroll down, while on iOS they are lazily added after all scrolling stops.

via Andrew Munn – Google+ – Follow up to “Android graphics true facts”, or The Reason….

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