But it is a lot more responsive.

Is there a way to make it degrade gracefully? The problem I see is that you can't have the JS and non-JS parts have the same URLs. The JS part will have urls like thesite.com/#question123, whereas the non-JS site will have urls like thesite.com/question123. So now you have two urls for each page, giving problems with search engines (and I think search engines will consider thesite.com/#x the same url as thesite.com/#y, and only load one of them).