The primary upsell I always heard on here, and I think google's pages on it, was that it could be prefetched without exposing the user's info to the publisher i

The primary upsell I always heard on here, and I think google's pages on it, was that it could be prefetched without exposing the user's info to the publisher if the user didn't click on it (because it's hosted on google's servers), and the prefetch was what made it faster, as well as being hosted on a cached cdn network.