Data Studies: Original Web Performance Research
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Request An AuditSites Cited in AI Overviews Pass Core Web Vitals 56.8% of the Time vs 40% Web-Wide
Nonprofit Website Speed: Two in Three Fail Core Web Vitals
Bank and Credit Union Website Speed: Local CUs Pass 57.4%, Megabanks 39%
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News Website Speed: the Biggest Outlets Pass Core Web Vitals 80% of the Time
Real Estate Website Speed: Only 40.2% of Local Sites Pass Core Web Vitals
University Website Speed: Fewer Than Half of .edu Sites Pass Core Web Vitals
Healthcare Website Speed: 66.5% of Local Practices Pass Core Web Vitals
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Law Firm Website Speed: Only 48.4% of Local Firms Pass Core Web Vitals
We measured 186 local law firms across 32 US metros. Only 48% pass Core Web Vitals on mobile, and the culprit is the marketing stack a local firm bolts onto its homepage.
Restaurant Website Speed: 71.5% Pass Core Web Vitals, but Chains Manage 38%
We measured 10,020 restaurant websites built on dedicated restaurant platforms. 72% pass Core Web Vitals on mobile with a median load of 1.2 seconds, while the app-heavy national chains are the slower ones.
Ecommerce Core Web Vitals: the Biggest Stores Pass 36%, the Smallest 65%
We ranked online stores by popularity and expected the biggest, best-funded retailers to lead. Google's field data runs the other way: just 36% of the top stores pass on mobile, versus about 65% of the small ones, and the whole difference is responsiveness.
Core Web Vitals by Site Popularity: the Top 1,000 Pass 64.7%, the Long Tail 39.2%
We split every site Google measures into traffic-popularity tiers. The top 1,000 pass on 64.7% of mobile origins, the tail beyond one million just 39.2%. But on mobile the top tier is far less responsive than the long tail.
Headless CMS Performance: No Platform Beats Wix's 53% Pass Rate
"Headless is faster" is a common claim. The field data on 23,747 origins shows Sanity and Prismic passing Core Web Vitals just above average, Contentful right at it, and none matching the fastest hosted builders around 53%.
Web Hosting Speed Compared: Pantheon Passes 61.2%, Bluehost 30.4%
We grouped roughly 11 million sites by hosting provider and measured real-user field data. The best host (Pantheon, 61% pass) beats the worst (Bluehost, 30%) two to one, with managed WordPress on top and budget shared hosting at the bottom.
51.3% of Sites Have a Good TTFB - the Slow Ones Pass LCP Just 6.3% of the Time
What is a good Time To First Byte, and how much does it matter? We checked TTFB across 10.6 million sites and found it sets the ceiling for loading speed: fast-server sites pass LCP 85.3% of the time, slow-server sites just 6.3%.
WordPress Passes Core Web Vitals Least Often of Any Major CMS, at 38.4%
WordPress runs more of the web than every other CMS combined, and passes Google's Core Web Vitals on mobile just 38.4% of the time, the lowest of any major platform. The reason is loading, not responsiveness.
Only 38.4% of WordPress Sites Pass Core Web Vitals
Is WordPress really slow? We checked the Core Web Vitals of nearly 3 million WordPress sites against the rest of the web. WordPress passes 38.4% of the time versus 44.1% for everything else, and the entire gap is load time. On responsiveness and stability, WordPress wins.
Elementor Is the Slowest Major WordPress Page Builder, Passing on 30% of Sites
We matched Chrome field data to the page builder running on more than two million WordPress sites. Elementor, the most-used builder, passes Core Web Vitals on just 30.0% of mobile sites, below native Gutenberg's 41.5%, and the problem is loading, not responsiveness.
The Fastest JavaScript Framework Isn't React, Vue or Angular - Alpine.js Passes 56.3%
We matched Chrome field data to the JavaScript framework running on 3.5 million-plus sites. React, Vue and Angular each pass Core Web Vitals on about a third of mobile sites, below the web-wide average, while lighter frameworks like Svelte and Alpine.js pass far more often, and the gap shows up on responsiveness.
Astro Passes Core Web Vitals on 48% of Sites. Next.js Manages 29.3%
We matched Chrome field data to the meta-framework running on 490,000 sites. Astro passes Core Web Vitals on 48% of mobile sites, Next.js on 29%, Nuxt on 25%. The frameworks that ship less JavaScript to the browser win, and the gap is mostly responsiveness.
Static Site Generators Compared: Hugo and Jekyll Hit 90% Good LCP, Next.js 29%
True static generators like Hugo and Jekyll have the best loading scores on the web (good LCP near 90%), but the JavaScript tools that share the "static" label (Next.js, Nuxt, Gatsby) pass Core Web Vitals far less often.
The Average Page Size Is 2.6MB, Across 71 Requests
We measured 15.7 million web pages. The median weighs 2.6MB and makes 71 requests, and across the whole range total weight barely predicts whether a site passes Core Web Vitals.
Two-Thirds of Failing Sites Fail on Just One Metric, Usually LCP
We analyzed how sites fail Core Web Vitals. Two-thirds of failing sites fail on just one of the three metrics, so most are a single fix from passing. On mobile that fix is usually loading.
INP on Mobile vs Desktop: 97.9% of Desktop Sites Pass, Only 82.5% on Mobile
We measured Interaction to Next Paint across 18 million websites. On desktop it is all but solved, with 97.9% passing. On mobile just 82.5% do, the widest device gap of any Core Web Vital.
The Median Page Load Time Is Now 2.0 Seconds, Down From 2.7 in 2020
Has the web actually gotten faster? We tracked real-user Core Web Vitals across six years. The median mobile site now loads in 2.0 seconds, taps answer in 100ms, and 87% of sites are visually stable. Every metric improved.
WebP Reached 16.6% of All Web Images. JPEG and PNG Still Hold 53%
We classified 435 million web images and tracked four years of change. WebP went from 2% to 17% of all images since 2022 and now appears on 40% of homepages, AVIF grew fortyfold but sits at just 4%, and JPEG and PNG together are still more than half of every image on the web.
Google Fonts Costs 9 Points of Good LCP
We checked web fonts across 9.5 million sites. Those loading Google Fonts are good on LCP just 63% of the time on mobile versus 72% without, a 9-point loading penalty. Web fonts are a real loading cost, and here is how to keep it small.
Bootstrap Passes Core Web Vitals on 45.7% of Mobile Sites. Tailwind Manages 36.8%
We matched Chrome field data to the CSS framework on 3 million sites. Bootstrap sites pass Core Web Vitals more often than Tailwind sites on mobile (45.7% vs 36.8%), but the difference is not the CSS. It is the JavaScript stack each framework travels with.
64% of the Mobile Web Still Runs jQuery, and Those Sites Are Faster
jQuery is supposed to be the slow legacy library you should drop. We checked 9.5 million sites: the ones still running it pass Core Web Vitals more often on mobile (44.2% vs 39.0%) than the ones without it, because the sites that dropped it moved to heavier frameworks.
Social Embeds Cost 8.6 Points of Good LCP
Sites running embedded third-party widgets pass Core Web Vitals on 38.7% of mobile origins versus 42.7% without, with an 8.6-point loading penalty.
A/B Testing Tools Cost 10.2 Points of Good LCP, the Worst of Any Third-Party Category
Sites running an A/B testing tool are good on LCP just 58.5% of the time on mobile versus 68.7% without, a 10-point loading penalty and the steepest of any third-party category we measured.
Live Chat Widgets Cost 9.5 Points of Good LCP
Sites running a live-chat widget pass Core Web Vitals on 37.6% of mobile origins versus 43.3% without, and loading takes the biggest hit, with good-LCP dropping nearly 10 points.
Google Tag Manager Costs 5.3 Points of Good LCP
Tag-managed sites are good on LCP about 5 points less often on mobile, yet they pass Core Web Vitals at nearly the same overall rate, because they tend to be better-maintained sites.
Cookie Banners Cost 3.7 Points of LCP, Yet Those Sites Pass Core Web Vitals More Often
Cookie consent banners add a real loading cost, with good-LCP down 3.7 points on mobile. Yet the sites that run them pass Core Web Vitals more often overall, because consent tools cluster on better-built sites.
Page Speed and Google Rankings: Page One Passes Core Web Vitals 47.6% vs 44.2% on Page Two
Page-one results pass Core Web Vitals 47.6% of the time vs 44.2% on page two; among competitive sites the gap widens to 7.6 points.
Mobile vs Desktop Speed: 84% of the Top 500 Sites Are Slower on Mobile
84% of the top 500 sites load slower on mobile than desktop, and only 44% pass Core Web Vitals on mobile vs 64% on desktop.
The Average Website Loads 375KB of Third-Party JavaScript
Third-party JavaScript on the median mobile page grew from 255 KB in 2020 to 375 KB in 2024, roughly two-thirds of all JS on a typical page.
Website Speed by Country: Sweden Passes 70.8%, Nigeria 7.8%
In Sweden, 70.8% of sites pass Core Web Vitals on mobile. In Nigeria, just 7.8% do, a 63-point spread across 40 countries.
49.1% of the Mobile Web Passes Core Web Vitals in 2026
49.1% of the mobile web and 58.0% of the desktop web pass all three Core Web Vitals in May 2026.
Website Speed by Industry: Government Passes 78.9%, Tech and SaaS 10%
Government and healthcare lead at 78.9% mobile pass; Technology & SaaS lags at 10.0%, a 69-point industry spread.
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