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The asynchronous ad code is a fully asynchronous version of the AdSense ad code that offers improved web latency and a better user experience for your site’s visitors. The advantage of the asynchronous code is that it's guaranteed never to get in the way of other parts of your web page loading. This means that users will be able to load the content of your pages, even if they’re having trouble loading the ads. Mobile users in particularly will enjoy less latency when loading web pages.
BTW, if you have multiple async codes, you must have only one request script!
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My old WYSIWYG HTML editor drops half the code when I enter it - this part here -
[edited by: ember at 8:12 pm (utc) on Oct 17, 2013]
I think he means that this part needs to be only repeated once.
<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
Thanks for the reminder Mentat, I made the mistake of including it multiple times!
Anatomy of the new tag:
A script, which only needs to appear once on your page, even if you have multiple ads. It is loaded asynchronously, so it is safe and most efficient to put it near the top.
<script async src="http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>