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    copied!<p>Here's an optimized version of your code, but like bvukelic said the whole concept would probably be more efficient with canvas.</p> <p>The problem I see with the code anyway is that delay and fade actions are indeed called synchronously, but the timeout is executed asynchronously, meaning that after a while you have multiple streams of actions on the same object (and this up to a hundred times).</p> <p>So the solution would be to append the repeated timeout as callback to the .fadeOut() action.</p> <pre><code>$(function() { var $win = $(window), winWidth = $win.width(), winHeight = $win.height(), showLoop = function(prob) { var fadeInDuration = prob.appear == 'fade' ? 1000 : 0; $('#'+prob.id) .delay(prob.interval*1000) .fadeIn(fadeInDuration) .delay(prob.duration*1000) .fadeOut(1000, function() { window.setTimeout(function() { showLoop(prob); // synchronously repeated callback }, 1000); }); }; $.ajax({ type: 'get', url: 'problems.xml', /* ...which contains like 99 problems */ dataType: 'xml', success: function(problems) { $('problem', problems).each(function() { var $t = $(this), probName = $('name', this).text(), prob = { type: $t.attr('type'), appear: $t.attr('appear'), name: probName, id: probName.replace(/\s/g, '').toLowerCase(), intensity: (parseInt($('intensity', this).text()) + 5) * 10, interval: parseInt($('interval', this).text()), duration: parseInt($('duration', this).text()), pos: { top = Math.random()*winHeight-(prob.intensity/2), left = Math.random()*winWidth-(prob.intensity/2) } }; $('&lt;p&gt;') .append('&lt;span&gt;'+prob.name+'&lt;/span&gt;') .attr('id', prob.id) .addClass(prob.type) .width(prob.intensity) .height(prob.intensity) .css({ top: prob.pos.top, left: prob.pos.left, }) .appendTo('body'); showLoop(prob); }); } }); }); </code></pre>
 

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