Use Google Adsense Asynchronous Code for Faster Sites

Its a good idea to try the new Google Adsense asynchronous ad code for faster loading sites in which the Adsense scripts will continue to load in the background simultaneously and will not slow down loading of your web pages. Asynchronous scripts are the current standard best practice in web design as it allows your webpages to load quickly, and the script does not get in the way of page loading. This also means that you can place the asynchronous script anywhere in the HTML document, and it will not delay the loading of page elements after the script.

In line with Google’s aim to make faster websites, it is recommended that all your scripts should be asynchronous so that they do not delay loading of other page elements.  It is definitely another way to make your sites faster. Remember how you can place Google Analytics code in the HEAD section of HTML without waiting for script loading.

Note that if the JavaScript’s in your page are not asynchronous, you should always add them at the bottom of your page code so that they do not slow page loading times.

Asynchronous Adsense Code

AdSense gives an option to choose the asynchronous script when you get code for the ad unit for your site.

asynchronous adsense code

This is how the earlier AdSense code looked like with the synchronous script

<script type="text/javascript"><!--
google_ad_client = "ca-pub-1234567890";
google_ad_slot = "12345";
google_ad_width = 336;
google_ad_height = 280;
<script type="text/javascript"

This is how the new AdSense code looks like with the asynchronous script

<script async src=""></script>
<ins class="adsbygoogle"
(adsbygoogle = window.adsbygoogle || []).push({});

Note that currently the asynchronous script is in beta phase testing, which means there could be bugs and errors and they are currently trying to make it better. They recommend that if you have problem in using the asynchronous script, you can continue to use the synchronous script which works for you very well right now. Go ahead and make your site faster.

Update: Note that you can load the async script once only and that will suffice for multiple ad units.