Recently we experienced a severe performance problem with IE8 rendering one of our pages in the InfoCodex web interface. It was taking about 1.5 minutes (yes, minutes not seconds!) for the page to display.
All other browsers, Firefox, Chrome, Iron, Safari, Opera and even IE7, rendered the page within 1-2 seconds.
I finally tracked down the problem to be the many small, different sized images, that where centred in table cells (as used for our heat map representation).
After making the images all the same size, fitting the size of the table cell and some other tweaks, I managed to get it down to about 8 seconds, although it is still substantially slower than the other browsers.
Other IE8 performance problems reported on the Web: see
http://www.switched.com/2009/03/13/microsoft-declares-ie8-fastest-browser-world-laughs/
http://digg.com/software/IE8_Performance_vs_Google_Chrome_and_Firefox
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