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POOptimizing my web application using Flash, Javascript and JSP
 

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    <p>I have a web app that I am trying to speed up. It looks like this: </p> <pre><code>+------+ | | | | +------+ +------+ | | | | +------+ +------+ | | | | +------+ </code></pre> <p>Each box is an iFrame containing a Flash SWF and some javascript. The SWF downloads a thirdparty SWF that is used to display information. I have found that the load time for the webapp is:</p> <pre><code>LoadTime = (4 seconds) * numberOfBoxes + (3 seconds) </code></pre> <p>When I just imbed the 3rd party swf directly (without our swf or the javascript) the load time is: </p> <pre><code>LoadTime = (1 second) * numberOfBoxes + (2.5 seconds) </code></pre> <p>I am trying to find where the extra 3 seconds is being used so that I can speed up our webapp. I think that the candidates are: </p> <ul> <li>Serverside processing (jsp)</li> <li>Download</li> <li>Javascript</li> <li>Flash</li> <li>Other?</li> </ul> <h2>Download</h2> <p>Below is an image of the downloads taken from firebug. I have replaced the file names with what their type is. None of the downloads are taking especially long <strong>after the first time</strong>. </p> <p>One place of interest however is marked in red. The red area is a 3 second gap between when <code>My SWF</code> is loaded and when two gif files are loaded followed by the <code>Third Party SWF</code>. I think this pause is caused by processing on the client (is this true?). </p> <p><img src="https://i.stack.imgur.com/HBgVd.jpg" alt="enter image description here"></p> <p><em>Note: The red bars in the graph are not part of the diagram. I added them to highlight the gap where nothing is occurring on the .net panel</em>.</p> <p>I think that I can conclude from this that I have a client side processing issue which implies either Flash or Javascript. <strong>Question 1: Is this correct?</strong></p> <p><em>Edit: I added up the total non-concurrent download time:</em></p> <ul> <li>When there is <em>1 iframes</em> the download time is <em>1.87 seconds</em></li> <li>When there is <em>2 iframes</em> the download time is <em>2.29 seconds</em></li> <li>When there is <em>5 iframes</em> the download time is <em>8.57 seconds</em></li> <li>When there is <em>10 iframes</em> the download time is <em>10.62 seconds</em></li> <li>When there is <em>21 iframes</em> the download time is <em>17.20 seconds</em></li> </ul> <h2>Javascript</h2> <p>I used the profiler in firebug to profile the javascript. Here are the results when there are four components on the page: </p> <p><img src="https://i.stack.imgur.com/iV248.jpg" alt="enter image description here"></p> <p>This means that the javascript is running for about .25 second/chart. This seems reasonable to me. </p> <p><strong>Question 2: Am I reading these results correctly?</strong></p> <p>This leaves about 3.5 seconds/chart of processing for something else. </p> <h2>Flash</h2> <p>I inserted some trace statements in the AS3 code. We are listening to an event called something like "done loading". I put a trace in the first initialize method and in the "done loading" method. The flash is only eating up .2 second/chart between those two trace statements. </p> <p><strong>Question 3: Is there a better way to to profile the flash? Could it be the flash loading or something like that that is eating up the extra time?</strong></p> <h2>Other</h2> <p>I am not sure if there are other things other than: </p> <ul> <li>Serverside processing (jsp)</li> <li>Download</li> <li>Javascript</li> <li>Flash</li> </ul> <p><strong>Question 4: Is there something that I am missing that could be eating up time?</strong></p> <h2>Next Steps</h2> <p>I am not sure what my next step should be. I know that something is taking about 1.5 - 3 seconds/chart but I cannot figure out what it is. I suspect that it is something related to my swf. </p> <p><strong>Question 5: How should I find that missing time?</strong></p> <h2><em>Update</em>: Time Summary</h2> <p>I have graphed all of the times for each thing that could be taking time. </p> <ul> <li>The X-axis is the number of charts that are being used.</li> <li>The Y-axis is the about of time loading all of the charts takes.</li> </ul> <p>The last graph is possibly the most important graph. The blue dots is the amount of total loading time (measured using a stop watch). The red dots are the amount of time that I have accounted for (Javascript, download time and flash time). </p> <p><img src="https://i.stack.imgur.com/0q3nR.jpg" alt="enter image description here"></p> <h2><em>Update</em>: Browser Wars</h2> <p>I am targeting IE and Firefox (although it is a nice bonus if other browsers work). All of the results presented so far are with Firefox with firebug running. Just for fun I thought I would try in other browsers. I don't think that this brings me closer to a solution but interesting to see how much IE sucks. </p> <p><img src="https://i.stack.imgur.com/XLXbf.jpg" alt="enter image description here"></p> <p><em>Note: Before running tests for Firefox I cleared the cookies and cache. I did not do this for IE or Chrome</em></p> <h2><em>Update</em>: Flash Loading</h2> <p>I have been sprinkling <code>console.log</code> statements though my code trying to sandwich the slow code. (The results get pushed out to the Firebug console). </p> <p>One thing that I have noticed that seems suspicious to me me is that there is a 2.5 second gap between when my last javascript log gets printed and when my first flash log gets printed. </p> <pre><code>17:08:29.973 - Javascript code Time difference: 2510 ms 17:08:32.483 - Flash- myComponent.init() </code></pre> <p>Does flash need to setup a virtual machine for each swf? Does it compile the actionscript on the client? </p> <p>What happens between when I <code>&lt;embed&gt;</code> my swf and when the <code>creationComplete</code> event in my main <code>.mxml</code>?</p>
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    1. COThis is one of the best written questions I have ever seen. Unfortunately I don't have answer for you.
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    2. COWith the upvotes he got his 50 points back, lol.
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    3. COYou may be interested in this [presentation on Flash internals/performance](http://www.onflex.org/ACDS/AS3TuningInsideAVM2JIT.pdf)
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