Grouping in IE very slow

I'm using jQuery 1.8.2 and data tables with the Grouping add on code. Works great! In Chrome at least. But in IE8 it takes around 20 seconds to bring back a table of 500 rows grouped into 20 groupings. Is there any insight any of you can give on this? Additionally, I'm working with JSF 1.2 in a RAD environment. Updating to new versions of anything is not an option.

Thanks!