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POJavaScript setTimeout() slows down under heavy load
 

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    <p>I've created a script that fades the background color of an element. I use setTimeout() to make an incremental change to the color every 5 ms. The script works great if I'm just fading the background color of one thing at a time, but if I've got, say, 50 elements I'm all fading at once, the speed is much slower than 5 ms because of all the concurrent setTimeout()s running at once. A fade that normally should execute in 1 second, for example, may take 30 seconds if I'm fading 50 elements at once.</p> <p>Any ideas how I can overcome this?</p> <p>Here's the script in case anyone has an ideas:</p> <pre><code>function fadeBackground(elementId, start, end, time) { var iterations = Math.round(time / 5); var step = new Array(3); step[0] = (end[0] - start[0]) / iterations; step[1] = (end[1] - start[1]) / iterations; step[2] = (end[2] - start[2]) / iterations; stepFade(elementId, start, step, end, iterations); } function stepFade(elementId, cur, step, end, iterationsLeft) { iterationsLeft--; document.getElementById(elementId).style.backgroundColor = "rgb(" + cur[0] + "," + cur[1] + "," + cur[2] + ")"; cur[0] = Math.round(end[0] - step[0] * iterationsLeft); cur[1] = Math.round(end[1] - step[1] * iterationsLeft); cur[2] = Math.round(end[2] - step[2] * iterationsLeft); if (iterationsLeft &gt; 1) { setTimeout(function() { stepFade(elementId, cur, step, end, iterationsLeft); }, 5); } else { document.getElementById(elementId).style.backgroundColor = "rgb(" + end[0] + "," + end[1] + "," + end[2] + ")"; } } </code></pre> <p>It's used like this:</p> <pre><code>fadeBackground("myList", [98,180,232], [255,255,255], 1000); </code></pre>
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