On 15 September 2026 Chrome added four experimental ad metrics to the Chrome UX Report (CrUX): Ad Count, Ad Density and two Ad Weight measures. They are not Core Web Vitals and Google has not called them a ranking signal. Sites that run display ads should check their numbers now and trim the heaviest ad slots.
CrUX is the dataset of real Chrome user experiences behind the field data in PageSpeed Insights and Search Console's Core Web Vitals report. Adding ad measurements to it gives site owners, and advertisers, a public view of how ad-heavy a site feels to real visitors.
Key takeaways
- On 15 September 2026 Chrome added four experimental ad metrics to the Chrome UX Report: Ad Count, Ad Density and two Ad Weight measures.
- Google says the metrics are not part of Core Web Vitals and have no suggested targets or thresholds.
- Google's page experience documentation now lists them as a resource, but Google has not described them as a ranking signal.
- Ad-supported sites should check their data and review heavy ad slots, which often hurt Core Web Vitals too.
What happened
In a Chrome for Developers post on 15 September 2026, Alex Cone announced the new metrics:
| Metric | Google's definition |
|---|---|
| Ad Count | "The average number of ads in the viewport" |
| Ad Density | "The average fraction of the viewport area occupied by ads" |
| Ad Weight (Network Usage) | Resources used by ads, measured in bytes |
| Ad Weight (CPU Usage) | Resources used by ads, measured in milliseconds |
Google says "You can access these new ad metrics in CrUX today", that they follow the same eligibility criteria as existing Web Vitals, and that they are "not part of Core Web Vitals and don't have suggested targets or thresholds". Further documentation is at developer.chrome.com/docs/ads. Search Engine Roundtable reported that the data can be viewed in CrUX Vis for sites with third-party ads.
The page experience documentation
A week later, Google added a "CrUX ad metrics" line to the resources section of its page experience documentation. The line says the experimental metrics "can help you understand your site's ad count". Search Engine Roundtable noted on 22 September 2026 that Google did not describe them as a ranking signal.
That is the honest position today: Google lists the metrics as a resource on a Search page, but has said nothing about using them for ranking. Anyone claiming otherwise is speculating.
Who this affects
- Publishers and bloggers funded by display ads, especially recipe, travel, hobby and local news sites.
- Comparison and directory sites with dense ad layouts.
- E-commerce sites running third-party retail media or sponsored product widgets.
- Agencies who manage ad-supported sites and report on performance.
Small business brochure sites without third-party ads will not see this data at all.
Even setting rankings aside, ads affect experience metrics that do matter. Late-loading ad slots are a classic cause of layout shift, and heavy ad scripts compete for the main thread, slowing responses to taps and clicks. Our guides to cumulative layout shift and interaction to next paint explain the links.
Practical checklist
- Look up your site in CrUX Vis. If your site has enough Chrome traffic and runs third-party ads, the ad metrics should appear alongside Web Vitals.
- Compare mobile and desktop. Ad density on a small screen is usually where problems show.
- Reserve space for every ad slot. Fixed-size containers prevent layout shift when ads load late.
- Cap ads above the fold on mobile, and lazy-load slots further down the page.
- Audit ad and tracking scripts. Remove partners that add weight without revenue. Our third-party scripts guide shows how to find them.
- Check your Core Web Vitals in Search Console and read our Core Web Vitals explainer if any are failing.
- Compress your own images so ads are not the only heavy assets on the page. Our free image compressor and image converter help.
- Check the back button. Google treats back button hijacking, which can come from ad scripts, as a spam violation; see our spam policy changes roundup.
- Talk to your ad network about density settings if your numbers look high.
Make It Flow's free tools for bloggers and publishers cover the technical basics, from broken links to redirects.
FAQ
Are the CrUX ad metrics a Google ranking factor?
Google has not said so. The Chrome announcement makes no statement about Search ranking, and the page experience documentation lists the metrics only as a resource to help you understand your site's ad count. Treat them as diagnostic data, not a confirmed ranking signal.
Are ad metrics part of Core Web Vitals?
No. Google states the ad metrics are not part of Core Web Vitals and do not have suggested targets or thresholds. Core Web Vitals remain Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift.
Why can't I see ad metrics for my site?
They follow the same eligibility rules as other CrUX data, so your site needs enough real Chrome traffic. They are also aimed at sites with third-party ads. If you do not run display ads, or your traffic is low, no ad data will appear.
What is a reasonable ad density?
Google has not published a target for these metrics. Use them to compare your own pages over time and against your user experience. If ads take up a large share of the mobile screen or visitors struggle to find your content, reduce them regardless of the number.
Who else can see my ad metrics?
CrUX is a public dataset, so anyone using CrUX tools can look up an eligible origin. Google's Alex Cone said he expects the metrics to be useful for advertisers and the services that place ads, which means buyers may use them to judge ad quality on your site.
Sources
- Chrome for Developers: CrUX ad metrics (15 September 2026)
- Google Search Central: Understanding page experience in Google Search results
- Search Engine Roundtable: Google Chrome User Experience Report with ad metrics (15 September 2026)
- Search Engine Roundtable: Google page experience docs adds CrUX ad metrics (22 September 2026)
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