I pay users on mechanical turk to run the speedtest and get about 1000 tests run each month from around the world. The speedtest does a single large file test and another test consisting of lots of small files downloaded concurrently like a browser would download a webpage. The results show that the Anycast CDNs (MaxCDN, CacheFly and Cotendo) generally perform better for the multiple smaller files (i.e. CSS, JS, images) due to usually lower latency, while large files generally download faster on the larger (as in more PoPs) DNS-based CDNs like Edgecast and CloudFront. Overall, the top performers based on this testing are Edgecast and CacheFly. CloudFront does well in Apac, but is only about average in the US. GoGrid or Speedyrails resells Edgecast at very reasonable pay-per-use rates.