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performance issue on iPad

Dec 28, 2011 4:50 AM

Tags: #issue #ipad #chart #performance #animation #moving #animate #animating

Hello everyone.


Im developing application for an iPad in Flash Builder 4.6 SDK 4.6.0 AIR 3.1 and i have a serious problem with making smooth animations, even with some simple objects that are not sprites. All i get is 5-10 fps while elements are moving. Normal it sticks to 60 fps.


I was trying to set renderMode to GPU with no luck.


My sample Main.xml looks like this (based on harts/ ):


<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx=""
                                 creationComplete="completeHandler()" cacheAsBitmap="true" cacheAsBitmapMatrix = "{new Matrix()}" frameRate="35">
                              protected var lastX:Number = 0;
                              [Bindable] protected var viewportMax:Number = 10;
                              private var frames:int,curTimer:int,prevTimer:int;
                              private var framerate:String;
                              protected function completeHandler():void
  // Simulate values
                                        var results:Array = [];
                                        for (var i:int=0; i<50; i++)
                                                  results[i] = Math.random() * 100;
                                        chart.dataProvider = results;
                              protected function mouseDownHandler(event:MouseEvent):void
                                        lastX = event.stageX;
                                        systemManager.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
                                        systemManager.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler);
                              protected function mouseMoveHandler(event:MouseEvent):void
                                        var delta:Number = (lastX - event.stageX) / chart.width * viewportMax;
                                        if (hAxis.minimum + delta < 0)
                                                  hAxis.minimum = 0;
                                                  hAxis.maximum = viewportMax;
                                        else if (hAxis.maximum + delta  > chart.dataProvider.length - 1)
                                                  hAxis.maximum = chart.dataProvider.length - 1;
                                                  hAxis.minimum = hAxis.maximum - viewportMax;
                                                  hAxis.minimum += delta;
                                                  hAxis.maximum += delta;
                                        lastX = event.stageX;
                              protected function mouseUpHandler(event:MouseEvent):void
                                        systemManager.removeEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
                                        systemManager.removeEventListener(MouseEvent.MOUSE_MOVE, mouseUpHandler);
                              private final function updateFrameRate():void
                                                  framerate = String(Math.round(frames*1000/(curTimer-prevTimer)));
                                        memBox.text="MEM in MB: "+ String(Math.round(1000*System.totalMemory/1048576)/1000);
          <mx:ColumnChart id="chart" top="100" left="10" width="400" height="250"
                                                  mouseDown="mouseDownHandler(event)" cacheAsBitmap="true" cacheAsBitmapMatrix = "{new Matrix()}">
  <mx:ColumnSeries />
                              <mx:LinearAxis id="hAxis" minimum="0" maximum="{viewportMax}"/>
                    <s:Label text="FPS: {framerate}" />
                    <s:Label text="" id="memBox" />
                    <s:Label text="test" id="storedLang" />



i'll be thankful for any help



  • Chris Campbell
    9,456 posts
    May 4, 2010
    Currently Being Moderated
    Jan 3, 2012 11:29 AM   in reply to Bonbon4345

    Thanks for the post and I'm sorry you're running into this issue.  I've forwarded this along to the iOS team for their review.  In addition, if you feel like this might be a bug against AIR and iOS, please feel free to create a new bug report over at  Once done, please post back with the bug's URL so that others can visit the bug to comment and vote.




    Mark as:
  • Currently Being Moderated
    May 21, 2012 3:35 AM   in reply to Bonbon4345

    Hi Bonbon,


    There are following suggestions that I can make. I tried your source and was able to improve the performance. During scrolls the fps number in your textfield now reads around 20 (iphone4) up from around 10.


    1) Use a flex mobile application instead of a flex application from your flash builder. You need not change the code at all for this mxml.

    2) Flex applications have a lot of actionscript code. Most of the time is spent in the framework code. AOT compiling your application with reduce this framework time a great deal and improve the performance a lot. Just use standard packaging from Flash Builder or use ipa-app-store target if you are packaging from command line.

    3) Remove the cache as bitmap statements from your application. I do not think they are adding any value instead I am concerned that they may be slowing it down.

    4) As always use release swf. Debug swfs have a lot of extra code.Visit this ublishing-air-applications/ to know how to create a release swf.


    Let me know if you still face issues.

    Mark as:

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