Avoid render-blocking resources
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Overview
This audit identifies resources (specifically scripts and stylesheets) which are
delaying the loading of ad tag libraries. These are resources that were
requested and received before ad tag libraries began loading. Reducing the
number of resources requested prior to tag load will speed up ad loading.
Recommendations
The details of this audit contain a list of all scripts and stylesheets that are
delaying tag load. The goal is to reduce the number of entries in this list as
close to 0 as possible. Some tips for doing this include:
- Loading ad tag libraries earlier in the
<head> of the page.
- Inlining scripts and stylesheets critical to core functionality directly into
your HTML.
- Marking non-critical scripts with the
async or defer attributes.
- Separating styles into different files by media query and using the
media
attribute to load them only when needed.
The following ad tag library scripts are supported:
| 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
|
Rendering Blocking Resources
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.
[null,null,["Last updated 2024-06-26 UTC."],[[["\u003cp\u003eThis audit helps identify scripts and stylesheets that slow down the loading of ad tags by being requested before them.\u003c/p\u003e\n"],["\u003cp\u003eReducing the number of these resources loaded prior to ad tags can significantly improve ad loading speed.\u003c/p\u003e\n"],["\u003cp\u003eOptimization strategies include loading ad tags earlier, inlining critical resources, using \u003ccode\u003easync\u003c/code\u003e or \u003ccode\u003edefer\u003c/code\u003e for non-critical scripts, and separating stylesheets by media query.\u003c/p\u003e\n"],["\u003cp\u003eSupported ad tag libraries include AdSense and Google Publisher Tag, with specific script URLs for identification.\u003c/p\u003e\n"]]],["The audit identifies scripts and stylesheets that delay ad tag library loading. To improve ad loading speed, reduce the number of resources requested before tag loading. Key actions include loading ad tag libraries earlier, inlining critical scripts/stylesheets, marking non-critical scripts with `async` or `defer`, and using the `media` attribute for conditional stylesheet loading. Supported ad tag libraries include AdSense and Google Publisher Tag, each with specific script URLs. The goal is to have minimal or zero items on this list.\n"],null,["# Avoid render-blocking resources\n\nOverview\n--------\n\nThis audit identifies resources (specifically scripts and stylesheets) which are\ndelaying the loading of ad tag libraries. These are resources that were\nrequested and received before ad tag libraries began loading. Reducing the\nnumber of resources requested prior to tag load will speed up ad loading.\n\nRecommendations\n---------------\n\nThe details of this audit contain a list of all scripts and stylesheets that are\ndelaying tag load. The goal is to reduce the number of entries in this list as\nclose to 0 as possible. Some tips for doing this include:\n\n- Loading ad tag libraries earlier in the `\u003chead\u003e` of the page.\n- Inlining scripts and stylesheets critical to core functionality directly into your HTML.\n- Marking non-critical scripts with the `async` or `defer` attributes.\n- Separating styles into different files by media query and using the `media` attribute to load them only when needed.\n\nMore information\n----------------\n\nThe following ad tag library scripts are supported:\n\n| 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[Rendering Blocking Resources](https://developers.google.com/web/tools/lighthouse/audits/blocking-resources) \n[View audit source](https://github.com/googleads/publisher-ads-lighthouse-plugin/tree/HEAD/lighthouse-plugin-publisher-ads/audits/ad-render-blocking-resources.js) [Improve this article](https://github.com/googleads/publisher-ads-lighthouse-plugin/tree/HEAD/docs/audits/ad-render-blocking-resources.md) [Report an issue](https://github.com/googleads/publisher-ads-lighthouse-plugin/issues/new?labels=documentation&template=documentation-feedback.md&title=Documentation+feedback%3A+ad-render-blocking-resources.md)\n\n\u003cbr /\u003e"]]
