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POWhy is CSS Hover Slow In IE8?
 

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  1. POWhy is CSS Hover Slow In IE8?
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    <p>I have a page with a jstree and/or jqgrid - it really doesn't matter which one I use to show my point, as I suspect it's any hover effect in IE8... Back to point:</p> <p>When hovering over an <code>&lt;a&gt;</code> tag the <code>background-color</code> is changed with CSS. In all browsers, including IE7 (although slightly slower - I'd guess +-300ms) there is no lag in the background change, but in IE8 the lag can get up to, and over, 1 second.</p> <ol> <li><p>I do not call any extra <code>onmouseover,onmouseout</code>, etc.. on any of these elements.</p></li> <li><p>I've turned off all animations in jQuery.</p></li> <li><p>Hiding all elements on the page except for the jstree(for example) does make the hover effect slightly faster, but nothing really noticable.</p></li> <li><p>Using the IE8 Debuggers profiler does not show any significant overhead, only normal times in the jQuery sizzle.js are noticeable</p></li> <li><p>This is after all document elements have been loaded and no extra calls are made to servers, no new images are downloaded,etc..</p></li> </ol> <p>Any advice on improving this, eg: <strong>performance tests</strong>, tag selection, etc.. would be appreciated greatly.</p> <p>Regards, Byron Cobb.</p> <p>P.S. This <a href="https://stackoverflow.com/questions/1526675/mouseover-hover-effect-slow-on-ie8">question</a> asked previously by bobmoff didn't really answer anything.</p> <p><strong>EDIT:</strong></p> <p>Further tests have shown that the jquery .hover() and binding mouseenter and mouseleave are also equally as slow in IE8. For example - I have removed everything on the page except for my jqgrid and the hover effect is still slow(although a slight increase is observed)</p> <p>Running IE8 in compatibility mode also fixes this slow hover issue.</p>
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    1. COOpen question to MS I reckon...
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