Hello,
I am using the AdServer in one url.net and the main site on a url.com location, while spreading ads through other websites. To speed up the AdServer, I am hosting it with both Google PageSpeed and Memcached enabled, while the banners are hosted in the Google Cloud (under ads.url.net). I am currently moving the call scripts to an Amazon Bucklet (cdn.url.net) so that publishers can pull it from there instead of the AdServer.
Besides this, I have CloudFlare enabled under a Pro account, which offers additional features to speed up both the site, and cache it faster.
To salientate, is that the AdServer in question is hosted on a Cloud server.
Regards.