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They have said themselves (Google) page speed is now a ranking factor and yet the slowest piece of our site is DFP (a Google product)
Google AdSense publishers:
• Have their ad space available to certified ad networks in the Ad Exchange. This means more quality display advertisers competing for their ad space and higher returns. AdSense publishers get the benefit of this through their AdSense interface, without having to log in to the Ad Exchange itself.