The culprit is Internet explorer document modes and the way they are 
evaluated.

When you open the page in Internet Explorer serving it from a webserver 
(http://yourdomain.com/yourpage.html), Internet Explorer goes into 
compatibility mode (IE9 renders the page use "IE7 standards" document mode). 
When you open the page from a file:// scheme (file://c:\whatever... ) IE9 
works in standard mode (the document mode is "IE9 standards").

The difference between the 2 is that the first is horribly slow (because of 
IE7 emulation), while the latter performs fine.
You can see the document mode (and change it) from the menu line of 
Developer Tools (F12 to open them in IE9).

You can force IE9 to work in standards mode always by using either META tags 
or a properly crafted DOCTYPE line. In your case, I fixed it (for IE9) by 
setting this meta in the head section:

<meta http-equiv="X-UA-Compatible" content="IE=9" >

You can read more about document modes here: 
http://msdn.microsoft.com/en-us/library/cc288325(v=vs.85).aspx . Completely 
understanding the whole way IE determines the best way to render a site is 
very tricky.

/R.

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