Load ad tag asynchronously
Stay organized with collections
Save and categorize content based on your preferences.
Overview
This audit ensures ad tag library scripts are loaded asynchronously.
By default, JavaScript execution is synchronous. This means that once a script
is encountered, no other content can be loaded until that script has been
downloaded, parsed, and executed. Opting into asynchronous execution prevents
this, allowing the browser to continue processing other resources while the
specified script is loaded in the background. This keeps your page responsive
while scripts are loading and decreses the time necessary to load all critical
components.
Recommendations
Include the async attribute in the script tag definition. For example:
AdSense
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
AdSense (auto ads)
<script async data-ad-client="ca-pub-xxxxxxxxxxxxxxxx" src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
Google Publisher Tag
<script async src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"></script>
The following ad tag library scripts are supported:
| Ad Tag Library |
Script(s) |
| AdSense |
pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
pagead2.googlesyndication.com/pagead/show_ads.js
|
| Google Publisher Tag |
googletagservices.com/tag/js/gpt.js
securepubads.g.doubleclick.net/tag/js/gpt.js
|
Get Started with Google Publisher Tags
GPT request modes and asynchronous rendering
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2024-06-26 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-06-26 UTC."],[[["\u003cp\u003eThis audit verifies if ad tag library scripts are loaded asynchronously to improve page performance.\u003c/p\u003e\n"],["\u003cp\u003eAsynchronous loading allows the browser to load other content while the script loads in the background, preventing delays and improving user experience.\u003c/p\u003e\n"],["\u003cp\u003eTo enable asynchronous loading, include the \u003ccode\u003easync\u003c/code\u003e attribute within the \u003ccode\u003e<script>\u003c/code\u003e tag when implementing ad tags like AdSense and Google Publisher Tag.\u003c/p\u003e\n"],["\u003cp\u003eSynchronous loading, where the browser waits for the script to fully load before proceeding, can negatively impact page load times and overall performance.\u003c/p\u003e\n"]]],["To optimize page load times, ad tag library scripts should load asynchronously. This is achieved by including the `async` attribute within the `\u003cscript\u003e` tag. Asynchronous loading allows the browser to continue loading other page content while the script downloads and executes in the background. Supported ad tag libraries include AdSense and Google Publisher Tag, with specific script URLs like `pagead2.googlesyndication.com/pagead/js/adsbygoogle.js` and `securepubads.g.doubleclick.net/tag/js/gpt.js` needing the `async` attribute.\n"],null,["# Load ad tag asynchronously\n\nOverview\n--------\n\nThis audit ensures ad tag library scripts are loaded asynchronously.\n\nBy default, JavaScript execution is synchronous. This means that once a script\nis encountered, no other content can be loaded until that script has been\ndownloaded, parsed, and executed. Opting into asynchronous execution prevents\nthis, allowing the browser to continue processing other resources while the\nspecified script is loaded in the background. This keeps your page responsive\nwhile scripts are loading and decreses the time necessary to load all critical\ncomponents.\n\nRecommendations\n---------------\n\nInclude the async attribute in the script tag definition. For example:\n\n### AdSense\n\n \u003cscript async src=\"https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js\"\u003e\u003c/script\u003e\n\n### AdSense (auto ads)\n\n \u003cscript async data-ad-client=\"ca-pub-xxxxxxxxxxxxxxxx\" src=\"https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js\"\u003e\u003c/script\u003e\n\n### Google Publisher Tag\n\n \u003cscript async src=\"https://securepubads.g.doubleclick.net/tag/js/gpt.js\"\u003e\u003c/script\u003e\n\nMore information\n----------------\n\nThe following ad tag library scripts are supported:\n\n| Ad Tag Library | Script(s) |\n|----------------------|-------------------------------------------------------------------------------------------------------------|\n| AdSense | `pagead2.googlesyndication.com/pagead/js/adsbygoogle.js` `pagead2.googlesyndication.com/pagead/show_ads.js` |\n| Google Publisher Tag | `googletagservices.com/tag/js/gpt.js` `securepubads.g.doubleclick.net/tag/js/gpt.js` |\n\n[Get Started with Google Publisher Tags](https://support.google.com/admanager/answer/1638622) \n\n[GPT request modes and asynchronous rendering](https://support.google.com/admanager/answer/183282) \n[View audit source](https://github.com/googleads/publisher-ads-lighthouse-plugin/tree/HEAD/lighthouse-plugin-publisher-ads/audits/async-ad-tags.js) [Improve this article](https://github.com/googleads/publisher-ads-lighthouse-plugin/tree/HEAD/docs/audits/async-ad-tags.md) [Report an issue](https://github.com/googleads/publisher-ads-lighthouse-plugin/issues/new?labels=documentation&template=documentation-feedback.md&title=Documentation+feedback%3A+async-ad-tags.md)\n\n\u003cbr /\u003e"]]
