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POPerformance problems with HTML5 Canvas in some mobile browsers.
 

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  1. POPerformance problems with HTML5 Canvas in some mobile browsers.
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    <p>Hi I have a Webapp that should be able to run on both Smartphone and Desktop Browsers alike. While I was expecting to get some curious behaviour on small devices like the Iphone, I was pretty confident that it would run well on an Android Galaxy Tab which is the Android Device that I can run tests with at the moment.</p> <p>Now I have installed a bunch of Browsers on the Galaxy Tab to test things with:</p> <ul> <li>Android Native Browser</li> <li>Chrome for Android</li> <li>Firefox for Android</li> </ul> <p>On the Desktop I have used </p> <ul> <li>Firefox</li> <li>Google Chrome</li> </ul> <p>and finally I have an Iphone to test with.</p> <p>The website uses HTML5 canvas for pixel and sprite based drawing no fancy transformation, filters or effects, mostly simple paths and polygons. I do listen to touch events and use <code>requestAnimationFrame</code> for proper redrawing.</p> <p>Overall the application runs well on Desktop Browsers, it is also running great on iOS Safari (iPhone) and Firefox-on-Android. Yet Androids Native Browser is giving me trouble. I have set it up so that the screen flushes red when the javascript is not responsive, and it does flash almost always when touching the screen.</p> <p>So I wonder whether there are any known issues with Android Native App and HTML5. Due to the nonexistent Name of the native Browser its quite hard to google information about this. <strong>Any ideas for me where I can get more information? Any ideas what might cause the lagging of the native Android browser?</strong></p> <p>There are a few ideas about the issue:</p> <ul> <li><p>iOS does not support requestAnimationFrame, therefore I replaced it with a timeout based replacement. If I use that replacement on Android's native browser, the problem persists.</p></li> <li><p>I use AJAX (google clojure xhrio) quite regularly to retrieve data from the server. Could it be that data retrieval callbacks are cloggin my event pipeline?</p></li> <li><p>Are log console messages (console.log) known to slow down applications? Could they trigger the browser to rerun through the DOM tree or anything related?</p></li> </ul>
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    1. USGustavo Carvalho
    1. USwirrbel
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    1. COI can't answer your actual question, but using console can consume a significant amount of memory depending on how you're using it. Especially if you're logging large objects or logging very frequently.
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