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Core Web Vitals Data Study w/ CrUX & 5.2M Pages

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Core Web Vitals Data Study w/ CrUX & 5.2M Pages

Core Web Vitals (CWV) are the speed metrics part of Google’s Page Experience signals used to measure user experience. The metrics measure visual load with Largest Contentful Paint (LCP), visual stability with Cumulative Layout Shift (CLS), and interactivity with First Input Delay (FID).

We wanted to look at the data to see how websites were doing and if we could glean any important insights.

The data we used is from the Chrome User Experience Report (CrUX), which is the source of Core Web Vitals data and is data from actual Chrome users.

In the public dataset, the data is aggregated at the origin (domain) level. We also wanted to look at page-level data, so we pulled over 5.2M pages with Core Web Vitals information in Ahrefs’ Site Audit.

Let’s dig in.

CrUX Data

Overall, we saw nearly 33% of websites passing Core Web Vitals thresholds. This is up ~10% from the previous year, indicating that websites are getting faster.

Graph showing percentage of good Core Web Vitals over time

Percentage of websites passing Core Web Vitals thresholds.

The improvements are similar on desktop and mobile. Most of the focus in 2021 was on mobile results. But generally, improving speed on mobile pages also improves speed on desktop pages.

Graph showing percentage of good Core Web Vitals by device

Core Web Vitals improvement by device.

Websites seem to be making progress on improving FID and CLS, but they are struggling with LCP. I’m not really surprised by this. LCP has the most components, making it the hardest to fix.

Graph showing percentage of good FID, LCP, and CLS over time

Percentage of good FID, LCP, and CLS over time.

Websites seem to struggle a bit more with LCP on mobile compared to desktop. It’s likely because of the connection speed and mobile CPUs having less processing power.

For FID, it looks like almost no one needs to worry about this metric on their desktop versions, and very few need to focus on this metric in general.

CLS is similar on mobile and desktop.

Graph showing breakdown of LCP, FID, and CLS by device

Further breakdown of LCP, FID, and CLS by device.

When you break down Core Web Vitals by connection speed, almost no sites on 3G or slower connections are passing. If many of your users are on slower connections or the internet in your country is slower, you’ll be fighting an uphill battle.

Graph showing percentage of good Core Web Vitals by connection

Passing Core Web Vitals by connection type.

Here’s another way of looking at the data with the individual metrics broken down by connection speed. The LCP threshold seems almost impossible to pass on slower connections.

Graph showing breakdown of LCP by connection type

Breakdown of LCP by connection type.

Few sites need to worry about FID, even on slower connections.

Graph showing breakdown of FID by connection type

Breakdown of FID by connection type.

Many sites struggle with CLS on slower connections.

Graph showing breakdown of CLS by connection type

Breakdown of CLS by connection type.

The location of your users seems to have a big impact. Different countries have different device preferences and different network infrastructures. If your users are in a country where everyone uses desktop devices with fast internet, your website will more likely have good Core Web Vitals. The opposite is likely true for websites whose users are all using older phones and on slower connections.

2 tables side by side. Left table shows 10 best countries for CWV with corresponding percentage of good CWV. Right shows 10 worst countries for CWV with corresponding percentage of good CWV

The U.S. is 38th in the data with a 41% passing rate. If you’re curious, here’s the full country data for August 2021.

Site Audit data

A quick thanks to Oleksiy Golovko for gathering this data from Ahrefs’ Site Audit. He pulled data from 43.66M unique pages. We found only 5.21M (~11.9%) had at least one Core Web Vitals metric, and 93% of those (or ~4.85M total) had all three metrics.

We also noted all of the pages had LCP (99.79%) and CLS (99.91%) metrics. The metric, FID, was missing the most and only available on 93.08% of pages that had any Core Web Vitals metrics.

Fewer pages than overall origins (domains) are passing Core Web Vitals (only 21.2% of pages passing). I’m not sure how to account for this fully. I suspect it may be due to caching where secondary page loads tend to be faster.

For page-level data, LCP is similar to the origin data. FID is better and something that doesn’t seem to be a concern for most pages. CLS is worse in the page-level data than the origin data.

Graph showing breakdown of CWV, LCP, FID, and CLS at the page level

Breakdown of page-level Core Web Vitals, including LCP, FID, and CLS.

Final thoughts

I wanted to study the impact of Core Web Vitals on rankings. But due to the timing of the rollout and other updates that happened at the same time, I don’t think there’s a good method that is conclusive. There are other studies that show a correlation between speed improvements and rankings. But saying this isn’t that different from saying sites that are more likely to work on their SEO also rank better than those that don’t.

If you want to record Core Web Vitals data for your site while you make improvements, you can enable the option in the Site Audit settings. All users, including free users, have access to this via Ahrefs Webmaster Tools.

If you’re having trouble improving your metrics or want to learn more about how pages load, check out our page speed guide.

What data surprised you the most? What data will you like to see if we update this study? Let me know on Twitter.




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Google’s AI Overviews Avoid Political Content, New Data Shows

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Google's AI Overviews Avoid Political Content, New Data Shows

Study reveals Google’s cautious approach to AI-generated content in sensitive search results, varying across health, finance, legal, and political topics.

  • Google shows AI Overviews for 50% of YMYL topics, with legal queries triggering them most often.
  • Health and finance AI Overviews frequently include disclaimers urging users to consult professionals.
  • Google avoids generating AI Overviews for sensitive topics like mental health, elections, and specific medications.

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Executive Director Of WordPress Resigns

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WordPress Executive Director Josepha Haden Chomphosy resigns,

Josepha Haden Chomphosy, Executive Director of the WordPress Project, officially announced her resignation, ending a nine-year tenure. This comes just two weeks after Matt Mullenweg launched a controversial campaign against a managed WordPress host, which responded by filing a federal lawsuit against him and Automattic.

She posted an upbeat notice on her personal blog, reaffirming her belief in the open source community as  positive economic force as well as the importance of strong opinions that are “loosely  held.”

She wrote:

“This week marks my last as the Executive Director of the WordPress project. My time with WordPress has transformed me, both as a leader and an advocate. There’s still more to do in our shared quest to secure a self-sustaining future of the open source project that we all love, and my belief in our global community of contributors remains unchanged.

…I still believe that open source is an idea that can transform generations. I believe in the power of a good-hearted group of people. I believe in the importance of strong opinions, loosely held. And I believe the world will always need the more equitable opportunities that well-maintained open source can provide: access to knowledge and learning, easy-to-join peer and business networks, the amplification of unheard voices, and a chance to tap into economic opportunity for those who weren’t born into it.”

Turmoil At WordPress

The resignation comes amidst the backdrop of a conflict between WordPress co-founder Matt Mullenweg and the managed WordPress web host WP Engine, which has brought unprecedented turmoil within the WordPress community, including a federal lawsuit filed by WP Engine accusing Mullenweg of attempted extortion.

Resignation News Was Leaked

The news about the resignation was leaked on October 2nd by the founder of the WordPress news site WP Tavern (now owned by Matt Mullenweg), who tweeted that he had spoken with Josepha that evening, who announced her resignation.

He posted:

“I spoke with Josepha tonight. I can confirm that she’s no longer at Automattic.

She’s working on a statement for the community. She’s in good spirits despite the turmoil.”

Screenshot Of Deleted Tweet

Josepha tweeted the following response the next day:

“Ok, this is not how I expected that news to come to y’all. I apologize that this is the first many of you heard of it. Please don’t speculate about anything.”

Rocky Period For WordPress

While her resignation was somewhat of an open secret it’s still a significant event because of recent events at WordPress, including the resignations of 8.4% of Automattic employees as a result of an offer of a generous severance package to all employees who no longer wished to work  there.

Read the official announcement:

Thank you, WordPress

Featured Image by Shutterstock/Wirestock Creators

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8% Of Automattic Employees Choose To Resign

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8% Of Automattic Employees Choose To Resign

WordPress co-founder and Automattic CEO announced today that he offered Automattic employees the chance to resign with a severance pay and a total of 8.4 percent. Mullenweg offered $30,000 or six months of salary, whichever one is higher, with a total of 159 people taking his offer.

Reactions Of Automattic Employees

Given the recent controversies created by Mullenweg, one might be tempted to view the walkout as a vote of no-confidence in Mullenweg. But that would be a mistake because some of the employees announcing their resignations either praised Mullenweg or simply announced their resignation while many others tweeted how happy they are to stay at Automattic.

One former employee tweeted that he was sad about recent developments but also praised Mullenweg and Automattic as an employer.

He shared:

“Today was my last day at Automattic. I spent the last 2 years building large scale ML and generative AI infra and products, and a lot of time on robotics at night and on weekends.

I’m going to spend the next month taking a break, getting married, and visiting family in Australia.

I have some really fun ideas of things to build that I’ve been storing up for a while. Now I get to build them. Get in touch if you’d like to build AI products together.”

Another former employee, Naoko Takano, is a 14 year employee, an organizer of WordCamp conferences in Asia, a full-time WordPress contributor and Open Source Project Manager at Automattic announced on X (formerly Twitter) that today was her last day at Automattic with no additional comment.

She tweeted:

“Today was my last day at Automattic.

I’m actively exploring new career opportunities. If you know of any positions that align with my skills and experience!”

Naoko’s role at at WordPress was working with the global WordPress community to improve contributor experiences through the Five for the Future and Mentorship programs. Five for the Future is an important WordPress program that encourages organizations to donate 5% of their resources back into WordPress. Five for the Future is one of the issues Mullenweg had against WP Engine, asserting that they didn’t donate enough back into the community.

Mullenweg himself was bittersweet to see those employees go, writing in a blog post:

“It was an emotional roller coaster of a week. The day you hire someone you aren’t expecting them to resign or be fired, you’re hoping for a long and mutually beneficial relationship. Every resignation stings a bit.

However now, I feel much lighter. I’m grateful and thankful for all the people who took the offer, and even more excited to work with those who turned down $126M to stay. As the kids say, LFG!”

Read the entire announcement on Mullenweg’s blog:

Automattic Alignment

Featured Image by Shutterstock/sdx15

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