Rackspace Cloud Files CDN is powered by Limelight, which is a big player in the CDN market. Limelight has a much bigger footprint, so it is likelier that there

Rackspace Cloud Files CDN is powered by Limelight, which is a big player in the CDN market. Limelight has a much bigger footprint, so it is likelier that there will be an edge server closer to the end user (or Pingdom's servers).