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Google Publisher Console - The tag comes with a built-in debugging and support tool called the Google Publisher Console, which is enabled on all pages containing the Google Publisher Tag. ...
The console provides checks for common tagging errors, visual highlights of all ad units and creatives on the page to help with debugging, and an alternative point of entry into the DFP front-end.
Single request mode - Single request mode means that instead of sending individual ad requests to DoubleClick servers, the browser is able to send one request notifying the server of all ad units on the page. This enables advanced roadblocking and improves page load time. ...
Since both Adsense and the new DFP are asynchronous, there shouldn't be any delay in rendering the page using either.
@DaStarBug Please post back with your results on using the built in AdSense with DFP. I am running AdSense as line items per some of your past blog posts and am interested to see how your upcoming change will perform.