If you run a website, the platform underneath it sets a Core Web Vitals floor before you touch a single setting. We measured that floor for US visitors, across every major platform, from real Chrome field data. Duda, Wix and GoDaddy sites clear all three Core Web Vitals for about 93 to 94 percent of US visitors. WordPress, the platform most US businesses actually run, sits at 68 percent, right at the US average. Weebly sits at 40 percent. Here is the whole board, and how it has moved over the last six months.
This is original research from Stackra's own corpus: 1.1 million verified US business websites, built from a monthly crawl of live homepages and automated platform detection, joined to the Chrome User Experience Report (CrUX), Google's field measurement of how real Chrome users experience a site. Full method and controls are at the end.
Two honesty notes before the numbers. First, these are US visitors specifically, not global traffic to US sites, and US numbers run higher than the worldwide figures you may have seen because US networks and devices are faster. That is a geography effect, not a platform-quality one. Second, Core Web Vitals only registers on sites with enough real Chrome traffic to measure, so the smallest sites are left out, never counted as failures.
The US Core Web Vitals leaderboard, August 2026
A platform's pass rate is the share of its US sites where 75 percent of real mobile visitors had Good scores on all three vitals at once: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness), and Cumulative Layout Shift (visual stability). A single failing vital drops a site out of the count. The all-US baseline is 70 percent, so any platform below that is starting its owners below the US average.
Duda tops the board at 94 percent. WordPress, the platform most US businesses run, passes 68 percent, exactly the US all-site average. Weebly is the only platform below half.
Baseline is 70 percent, the pass rate across all eligible US sites. Source: Stackra corpus joined to Chrome UX Report field data (US visitors, mobile), August 2026.
| Platform | CWV pass | LCP pass | INP pass | CLS pass | Median LCP | US sites measured |
|---|---|---|---|---|---|---|
| Duda | 94% | 99% | 99% | 95% | 1.1 s | 8,197 |
| Wix | 93% | 96% | 98% | 98% | 1.0 s | 17,391 |
| GoDaddy Website Builder | 93% | 98% | 99% | 95% | 1.0 s | 3,975 |
| Shopify | 91% | 97% | 98% | 95% | 1.3 s | 27,336 |
| Squarespace | 87% | 93% | 99% | 93% | 1.5 s | 19,970 |
| Webflow | 87% | 92% | 97% | 95% | 1.3 s | 5,501 |
| Framer | 84% | 92% | 93% | 95% | 1.3 s | 370 |
| Drupal | 83% | 90% | 97% | 93% | 1.5 s | 5,791 |
| HubSpot CMS | 79% | 94% | 97% | 86% | 1.5 s | 1,820 |
| Joomla | 75% | 83% | 97% | 92% | 1.8 s | 2,015 |
| WordPress | 68% | 76% | 95% | 88% | 1.9 s | 131,454 |
| Weebly | 40% | 44% | 78% | 43% | 3.3 s | 3,619 |
| All US sites | 70% | -- | -- | -- | -- | 350,084 |
Pass = share of sites where 75 percent of real US mobile visitors had Good scores. Framer's 370 measured sites is a thin sample, read it with care. Source: Stackra corpus, Chrome UX Report field data (US visitors, mobile), August 2026.
Why these beat the worldwide numbers
You will see lower pass rates quoted almost everywhere else, because almost everywhere else is worldwide. About 53 percent of all sites pass Core Web Vitals globally; 70 percent of US sites do. Same platforms, different visitor population: US networks and devices are simply faster, so the same Shopify store clears the thresholds more often for a shopper in Denver than for the global average of its visitors. Both numbers are real. Quote one or the other, and say which. If you want the worldwide version of this table, we keep one.
The six-month view: US platform speed has plateaued
We measured the same set of sites at two points, February 2026 and August 2026, on US visitors. Almost nothing moved. The all-US baseline went from 70.2 percent to 70.3 percent, and not one platform shifted more than 2.5 points. The dramatic quarter-over-quarter platform swings people cite ("Wix jumped four points") are worldwide, population-churn stories. On US-visitor data for established sites, there is no trend to chase.
Not one platform moved more than 2.5 points in six months. If you are waiting for your platform to get faster on its own, the US data says do not hold your breath.
Percentage-point change in US CWV pass rate. Note the scale: no platform moved more than 2.5 points in six months. Source: Stackra corpus, CrUX US field data, February and August 2026.
| Platform | Feb 2026 | Aug 2026 | Change |
|---|---|---|---|
| Duda | 93.6% | 94.2% | +0.6 |
| Wix | 92.1% | 92.5% | +0.4 |
| GoDaddy Website Builder | 91.9% | 92.6% | +0.7 |
| Shopify | 90.0% | 90.8% | +0.8 |
| Squarespace | 87.1% | 86.5% | -0.6 |
| Webflow | 85.3% | 87.2% | +1.9 |
| Framer | 85.6% | 84.1% | -1.5 |
| Drupal | 83.6% | 83.0% | -0.6 |
| HubSpot CMS | 79.2% | 78.7% | -0.5 |
| Joomla | 77.3% | 74.8% | -2.5 |
| WordPress | 68.2% | 68.0% | -0.2 |
| Weebly | 41.7% | 40.4% | -1.3 |
| All US sites | 70.2% | 70.3% | +0.1 |
Figures to one decimal to show the small movements; the leaderboard above rounds to whole numbers. Same cohort measured at both dates. Source: Stackra corpus, CrUX US field data.
Platforms where the floor is lower
Knowing your platform's real US floor is the point of this table. It tells you whether a Core Web Vitals problem is yours to fix or baked into the platform. Four cases are worth calling out.
- •Weebly, 40 percent: the lowest of any tracked builder, dragged by loading (44 percent good LCP) and layout shift (43 percent good CLS). If you are on Weebly, that is the platform floor, not a verdict on your own setup.
- •WordPress, 68 percent: the overall number hides the one that matters, your page builder. Block-editor and Site-Editor sites pass far more often than Elementor or WPBakery sites. Benchmark against your builder, not the WordPress average.
- •HubSpot CMS, 79 percent: solid overall, but layout shift is its weak metric (86 percent good CLS) because its module system loads content in after the page first paints.
- •Custom-coded and enterprise platforms: our companion study found hand-built sites and enterprise DXP platforms pass Core Web Vitals least often, around 55 percent, below every major builder. The most expensive way to run a site is not the fastest.
The companion study: why hand-built and enterprise sites underperform builders, and why it comes down to how the page renders.
Builder detection, plugin overhead, and caching: what actually moves a WordPress site's Core Web Vitals.
What this means for your site
The practical read depends on where you are.
- •Find your platform's real US floor in the table above. If you are well below it, there is a specific problem worth finding. If you are at or above it, your platform is not your bottleneck, and content and links are the better use of your time.
- •Separate structural problems from addressable ones. Squarespace's loading drag and HubSpot's layout shift are largely platform behavior with limited owner recourse. Your images, apps, and third-party scripts are yours to fix on any platform.
- •Platform is a floor, not destiny. A WordPress site on the block editor with lean hosting can clear the WordPress average comfortably. A Shopify store with fifteen apps and uncompressed product images will fall below the Shopify floor. The platform sets the ceiling; your configuration and content set where you land under it.
Baselines and controls
So you can weight the read, here is what this comparison holds constant and what it does not.
| Held constant | Not controlled |
|---|---|
| US business sites only, one row per registrable domain | Business-type mix differs by platform (Shopify skews retail, Weebly skews older local sites) |
| The same pass rule everywhere: LCP, CLS, and INP at their p75 US field thresholds | Field-data coverage varies by platform, so measured populations are not identical |
| US visitors specifically, CrUX country data, not global traffic | Site age and hosting tier within each platform are not held equal |
| Same cohort measured at both dates for the six-month view | These are raw conditional rates, directional not causal |
Baseline: 70 percent of eligible US sites pass Core Web Vitals on mobile (August 2026). Measured on 350,084 US sites with field data.
Methodology
The corpus is 1.1 million US business websites assembled from a monthly HTTP Archive crawl of live homepages, deduplicated to one row per registrable domain, with platform detected from its technology fingerprint. Core Web Vitals come from the Chrome User Experience Report, US-visitor field data (its country_summary table filtered to the United States, mobile): a site passes when 75 percent of its real US mobile users clear Largest Contentful Paint at or under 2.5 seconds, Cumulative Layout Shift at or under 0.10, and Interaction to Next Paint at or under 200 milliseconds. A site is eligible only if it has all three metrics in the field. The same query drives the platform baselines inside Stackra's own audit, so the report and this study agree.
Frequently asked questions
Common questions about US Core Web Vitals pass rates by platform.
Which website platform has the best Core Web Vitals in the US?
Duda leads at 94 percent of US sites passing all three Core Web Vitals on mobile as of August 2026, followed by Wix and GoDaddy Website Builder at 93 percent and Shopify at 91 percent. Among the platforms most small businesses use, Wix and Shopify are the strongest.
What is WordPress's Core Web Vitals pass rate in the US?
68 percent of US WordPress sites pass all three Core Web Vitals on mobile as of August 2026, right at the 70 percent US average. The figure varies heavily by page builder: block-editor and Site-Editor sites pass far more often than Elementor or WPBakery sites, so benchmark against your builder rather than the WordPress average.
What is the average Core Web Vitals pass rate for US websites?
70 percent of eligible US sites pass all three Core Web Vitals on mobile as of August 2026. This is higher than the worldwide figure of about 53 percent because US networks and devices are faster, a geography effect rather than a difference in how sites are built.
Why are US Core Web Vitals pass rates higher than worldwide ones?
Because they measure different visitors. Worldwide figures pool every visitor to a site; US figures count only US visitors, who are on faster networks and newer devices. The same site clears the thresholds more often for its US visitors than for its global average, so US pass rates run well above worldwide ones on every platform.
Have platform Core Web Vitals changed much in 2026?
Not in the US. Measured on the same sites from February to August 2026, the US all-site pass rate moved from 70.2 to 70.3 percent, and no platform shifted more than 2.5 points. The larger quarter-over-quarter swings you see quoted are worldwide numbers affected by which sites enter and leave the sample, not real movement on established US sites.
Which platforms have the worst Core Web Vitals in the US?
Weebly is the lowest tracked builder at 40 percent, held back by slow loading and layout shift. Below the named builders, custom-coded sites and enterprise DXP platforms pass least often of all, around 55 percent in our companion study. WordPress at 68 percent is at the US average but highly variable depending on its page builder.