Performance problem with jQuery UI

After including a jQuery UI theme in my application, the performance of the 
ie7-js went downhill. A page that took less than 1 second to render is now 
taking 4-5 seconds. I tested with both IE8.js and IE9.js and they had the same 
problem.

Steps to reproduce:
- Add any jQuery UI css in the application (I am using the sunny theme)

This is a simple html that shows the problem:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" >
    <head>
        <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
        <title>teste</title>

        <!--[if lt IE 9]>
        <script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE9.js"></script>
        <![endif]-->

        <link type="text/css" href="../../css/sunny/jquery-ui-1.8.4.custom.css" rel="stylesheet" />

        <style TYPE="text/css">
        <!--
        #test {
            width:100px;
            height:100px;
            background-color:red;
        }

        body.ie7_body #test {
            background-color: blue;
        }
        -->
        </style>
    </head>
    <body>
        <div id="test">
        </div>
    </body>
</html>

Original issue reported on code.google.com by cesar.ca...@gmail.com on 17 Aug 2010 at 12:40

a156845044 / ie7-js

Performance problem with jQuery UI #272