We ran some tests on using CloudFlare for our S3 assets. It didn't speed things up at all. On top of that, quite a few people have reported that CloudFlare wou

We ran some tests on using CloudFlare for our S3 assets. It didn't speed things up at all. On top of that, quite a few people have reported that CloudFlare would serve CAPTCHAs to users / mark the site as down and serve a static version. Anecdotally, I have seen this happen before browsing CloudFlare-enabled sites once or twice. One other issue we saw: the incorrect image was once served. That was pretty disconcerting. Between all of these issues, we gave up and ended up using CloudFront. It's a shame because CloudFlare is so much more feature-ful and pleasant to use. But I don't think it's a mature product yet.