Do you mind sending a zip of the .hype document? I'd be useful to point out which animation is particularly bad for you - they seem to be pretty quick for my eye!
One of the issues with blurs is that they perform very differently based on the rendering mode the browser is using (aka graphics acceleration or not enabled). Hype has a large decision tree to decide to use the graphics acceleration for given elements, so it could be that even though you are requesting a blur there's another effect causing it to use a slower mode.
(Also the document from the other post looks fine to me now, so I think the cause of that was fixed).