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Probably a dumb question, what is the benefit from using Cloudflare? If I naively set up a page like this I would have just done S3 directly, right?

cloudfare will cache your content in much much more locations across the globe unlike plain s3. (cloudfront from amazon does the same thing)

It may just be my own setup but to me it seemed slower to load than many other sites I visit.

Loads fine for me even on mobile, but then I get http://i.imgur.com/JpxvAOz.jpg when I try to sign up (iOS, Safari).