the site takes 10 sec to load in my FF Australia.
The same here on iPad. I think, a quite appropriate time for such a content loaded site.
a) Depending on the browser, initializing the video playback may take a while. It's better in Chrome than anywhere else.
b) The connection to the Flickr gallery could be an issue. Flickr is notoriously unreliable and can cause major connection time-outs or delays at least.
c) Similar things could happen with any of the other external sources like the Twitter feed, Vimeo etc..
d) You have multiple fancy items on a single scrolling page and they all initialize scripts. You could possibly optimize this by manually consolidating everything, but that's beyond Muse.
e) You use quite a bit of CSS animation, which may simply cause performance issues on some systems. This could cause things to only be drawn once the buffers have been rendered off-screen. Conversely, such stuff can generally cause extra drawing calls and refreshes.
Beyond those generics I don't see much that is unusal. It's not the fastest page in the world, but some things are inevitable if you go flashy. Again, a lot could be optimized by cleaning up the code, so you might want to hire some HTML/ CSS/ JS savvy person to do it based on your "prototype".