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I love the website, and specifically the changing backgrounds. Felt like a one-on-one presentation more than a website.

I agree, it's cool. The only drawback I noticed is that my browser seemed labored in scrolling. Anybody know why?

Probably because the javascript require to change the background would pause the scrolling or slow down the browser.

One way to fix it (at least a little) is to do the background change asynchronously (setTimeOut)

I totally agree. Big props with making it work nicely on mobile Safari too.