This past weekend I spent an hour optimizing the [Flex 4 scrolling demo][1] that I posted last week. The original demo was intended to show how to hook up touch events to the Flex 4 List / DataGroup controls. This new version adds some optimizations for the touch event handling and adds the kinetic flick behavior. Check it out and let me know what you think:



I've posted [the code][2] for this second version of the [touch scrolling demo][3]. It was pretty trivial to optimize it this far. With a little more work it'll be as smooth as silk and as fast as Apolo Ohno. :)

Over the past few days I've received some questions about the performance of Flex apps on mobile devices. My [Census RIA Benchmark][4] has been a great way to compare the performance of various data loading techniques and technologies. Now that I have my Android based Nexus One mobile device with an early build of Flash Player 10.1 I wanted to see how fast I could load and render large amounts of data in a Flex application. I'm really impressed with the results! 20,000 rows of data loaded from the server and rendered on my phone in about 2 seconds! Those 20,000 rows can then be sorted on the device instantaneously. Pretty amazing performance for such a little device! Check out the video:



You can run the mobile version of the [Flex AMF Census Test][5] and check out the [source code][6]. Let me know what you think.

 [1]: http://www.jamesward.com/2010/02/19/flex-4-list-scrolling-on-android-with-flash-player-10-1/
 [2]: http://www.jamesward.com/demos/MobileListSwipe2/srcview/
 [3]: http://www.jamesward.com/demos/MobileListSwipe2/MobileListSwipe2.html
 [4]: http://www.jamesward.com/census
 [5]: http://www.jamesward.com/demos/MobileCensus/MobileCensus.html
 [6]: http://www.jamesward.com/demos/MobileCensus/srcview/index.html