If you live close to a peering point, both CF and Google will have mean ping times <10ms, often even <5ms. I doubt there's any real world difference between usi

If you live close to a peering point, both CF and Google will have mean ping times <10ms, often even <5ms. I doubt there's any real world difference between using localhost and either of them. As they cache results, using them could actually be faster than your own server.