I've been experiencing some embarassing slowness on complex JavaScript sites and apps including our own Vox, when I use IE6 on my Windows XP ThinkPad X40 laptop. Today it's fixed with this Microsoft KB942840 XP update. I'm not sure if it was installed via normal Windows update (it's not a security update so it's not probably mandatory) or via ThinkPad software update. Vox compose screen now show