Serious problem with jQuery Dialog and IE6

Hi,
I have been using jQuery Dialog for my project, haven't met any
problem until this morning, I found when the HTML page is large, then
it takes a very long time for dialog to open or close, however this
doesn't happen with Firefox, has anyone else met the same problem with
IE6? If this can't be solved, then I will have to switch to another
dialog solution which I reluctant to do.
Thanks.