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    <p>Since you experience your lag <em>'sometimes'</em>, and it's not a low frame rate issue, i would rather move my eyes towards the evil garbage collector : whenever it triggers, the application will freeze for up to a few milliseconds, and you'll get a frame miss.<br> To watch for this, you can use google profiling tools, in TimeLine / Memory / press the record button : you can see that a GC occurred when there's a sudden drop in the memory used.<br> Beware when using this tool, that it slows down a bit the app, and it creates garbage on its own (!)...<br> Also, since any function call for example creates a bit of garbage, so you can't have a full flat memory line.</p> <p>Below i show the diagram of a simple game i made <em>before</em> i optimized memory use,<br> there's up to 5 GC per second : </p> <p><img src="https://i.stack.imgur.com/MVSPv.png" alt="enter image description here"></p> <p>And here the diagram of the very same game <em>after</em> memory optimisation : there's something like 1 GC per second. Because of the limitations i mentioned above, it is in fact the best we can get, and the game suffers no frame drop and feels more responsive. </p> <p><img src="https://i.stack.imgur.com/k9fHv.png" alt="enter image description here"></p> <p>To avoid creating garbage<br> - never create object, arrays or functions.<br> - never grow or reduce an array size.<br> - watch out for hidden object creation : Function.bind or Array.splice are two examples. </p> <p>You can also :<br> - Pool (recycle) your objects - use a particle engine to handle objects that are numerous / short lived.</p> <p>I made a pooling lib (<a href="http://gamealchemist.wordpress.com/2013/02/02/no-more-garbage-pooling-objects-built-with-constructor-functions/" rel="nofollow noreferrer">here</a>) and a particle engine (<a href="http://gamealchemist.wordpress.com/2013/06/16/introducing-jsparkle-a-versatile-and-fast-javascript-particle-engine/" rel="nofollow noreferrer">here</a>) you might use if you're interested. </p> <p>But maybe first thing to do is to seek where you create objects, and have them created only once. Since js is single-threaded, you can in fact use static objects for quite a few things without any risk. </p> <p>Just one small expl :</p> <pre><code>function complicatedComputation(parameters) { // ... var x=parameters.x, y = parameters.y, ... ... } // you can call creating an object each time : var res = complicatedComputation ( { x : this.x, y : this.y, ... ... } ); //... or for instance define once a parameter object : complicatedComputation.parameters = { x :0, y:0, ... ... }; // then when you want to call : var params = complicatedComputation.parameters; params.x = this.x ; params.y = this.y; ... ... var res = complicatedComputation(params); </code></pre> <p>It has the drawback that previous calls parameters remains, so you don't get undefined if you don't<br> set them, but previous value, so you might have to change bit your function.<br> But on the other hand, if you call several times the function with similar parameters, it comes very handy.</p> <p>Happy memory hunting !</p>
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