Map works fine in FireFox 1.5, Opera but not in IE6

Hi Folks,
I've looked for this answer to no avail.

http://www.pillowsandpancakes.com/smap

My mash-up works well in FireFox 1.5 and Opera. But in IE
6.0.2900.2180.xpsp_sp2_gdr.050301-1519 it can take over 1 min for a
page to load. It is very very very slow.

Anyone have an idea?

Paul