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    <p>First off, i don't think doing <code>$('body *').live</code> is a very good idea, it seems very expensive (think about the kind of calculation the browser has to do every time you move your mouse)</p> <p>That said, here is an optimized version that ignores that aspect</p> <pre><code>var $div = $('&lt;div&gt;') .css({ 'border': '1px solid red', 'position': 'absolute', 'z-index': '65535' }) .appendTo('body'); $('body *').live('mousemove', function(e) { var topElement = null; var $bodyStar = $('body *'); for(var i=0,elem;elem=$bodyStar[i];i++) { if(elem == $div[0]) continue; var $elem = $(elem); var pos = $elem.offset(); var width = $elem.width(); var height = $elem.height(); if(e.pageX &gt; pos.left &amp;&amp; e.pageY &gt; pos.top &amp;&amp; e.pageX &lt; (pos.left + width) &amp;&amp; e.pageY &lt; (pos.top + height)) { var zIndex = document.defaultView.getComputedStyle(this, null).getPropertyValue('z-index'); if(zIndex == 'auto') zIndex = $elem.parents().length; if(topElement == null || zIndex &gt; topElement.zIndex) { topElement = { 'node': $elem, 'zIndex': zIndex }; } } } if(topElement != null) { var $elem = topElement.node; $div.offset($elem.offset()).width($elem.width()).height($elem.height()); } }); </code></pre> <p>For future reference, never use jQuerys looping mechanisms if you need performance. They are all build around function calls for every iteration, which is very slow compared to a normal loop, since the call stack initiation that happens when you do a function call is a huge overhead for most iteration operations you need to do.</p> <p>Code updated to fix errors, and allow for dynamically inserted elements.</p>
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    1. POHow do I efficiently highlight element under mouse cursor with an overlay?
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    1. USMartin Jespersen
    1. USMartin Jespersen
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    1. COFirst of all, it's better to use `addClass()` than `.css()`. Second, may I ask when will your `for` loop end looping?
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      1. USReigel
    2. COIt will end when $bodystar[i] retruns undefined, which it will do when i reaches the length of the array. It is the most efficient way to loop over an array you know doesn't contain values that will evaluate to false
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      1. USMartin Jespersen
    3. COactually using while(i--) is faster but thats a whole different ballgame :)
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