---
title: "Astro vs Next.js Speed 2026: 48% vs 29% Pass CWV"
description: "Astro passes Core Web Vitals on 48 percent of mobile sites versus 29.3 for Next.js and 24.9 for Nuxt. Analysis of 490,000 sites."
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Data Study · Frameworks
# Astro Passes Core Web Vitals on 48% of Sites. Next.js Manages 29.3%
Written by [Matt Suffoletto](/resources/author/matt-suffoletto)
Published July 15, 2026 8 min read
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On This Page
- [Methodology](#methodology-source "Methodology")
- [Key Findings](#key-findings "Key Findings")
- [Summary](#summary "Summary")
- [What the Data Covers](#what-the-data-covers "What the Data Covers")
- [Least JavaScript Wins](#the-framework-that-ships-least-javascript-wins "Least JavaScript Wins")
- [Islands vs Full Hydration](#islands-versus-full-hydration "Islands vs Full Hydration")
- [App Router and Desktop](#app-router-helps-desktop-erases-the-gap "App Router and Desktop")
- [Choose the Lighter Architecture](#choose-the-architecture-that-ships-less-javascript "Choose the Lighter Architecture")
- [Embed & cite](#embed "Embed & cite")
- [FAQ](#faq "FAQ")
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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.
Analysis of 9.58M origins scanned · CrUX + HTTP Archive, May 2026
Part of our [JavaScript Framework Performance Statistics 2026](/resources/statistics/javascript-frameworks) research.
## Methodology & Source
Data source
HTTP Archive technology detection (June 2026 crawl, Wappalyzer) joined to Chrome UX Report (CrUX) field data via BigQuery
Collection date
May 2026
Notes
Root-page origins running each meta-framework with a CrUX reading, measured on mobile at the 75th percentile against the strict all-three Core Web Vitals pass convention.
## Key Findings
1. 1. [**Astro** passes Core Web Vitals on **48.0%** of mobile sites, versus **29.3%** for Next.js and **24.9%** for Nuxt.js. Astro's real-world pass rate is more than 1.6 times Next.js's and roughly double Nuxt's. ](#the-framework-that-ships-least-javascript-wins) Copy stat
2. 2. [**Nuxt.js** is the weakest meta-framework in the set on mobile ( **24.9% pass**, 48.4% good LCP, 63.1% good CLS), the lowest loading and stability scores of the group. ](#the-framework-that-ships-least-javascript-wins) Copy stat
3. 3. [**Next.js App Router (31.1%)** edges out the older Pages Router baseline (29.3% across all Next.js) and pulls ahead on desktop ( **55.8% vs 52.4%**). React Server Components help, but they do not close the gap to Astro. ](#app-router-helps-desktop-erases-the-gap) Copy stat
4. 4. [The meta-framework gap is largely a **responsiveness (INP)** story on mobile. Astro is good-INP on **88.9%** of sites, Next.js on just **66.3%**, Nuxt on **72.8%**, both below the 82.5% web-wide average. ](#islands-versus-full-hydration) Copy stat
5. 5. [On **desktop** the field flattens. Every meta-framework passes **43% to 56%** with **95% to 99%** good INP. The penalty for heavy client-side JavaScript is a mobile-hardware penalty. ](#app-router-helps-desktop-erases-the-gap) Copy stat
6. 6. [The pattern rewards "less JavaScript by default." Astro's islands architecture ships static HTML with selective hydration, and the field pass rates track that difference directly. ](#choose-the-architecture-that-ships-less-javascript) Copy stat
## Summary
Next.js and Nuxt are marketed on speed: server rendering, static generation, image optimization, all aimed at Core Web Vitals. Astro made a different bet, shipping mostly static HTML and hydrating only the interactive pieces. Across 490,000 sites, the field data says Astro's bet paid off. Astro passes Google's Core Web Vitals on 48% of mobile sites, more than 1.6 times Next.js at 29% and roughly double Nuxt at 25%.
That difference decides real outcomes. Speed determines whether visitors stay, whether they convert, and how a page ranks in Google. Core Web Vitals measure the experience directly: how fast the main content loads, how quickly the page answers a tap, and how steady the layout stays. A meta-framework that passes half as often as another is, in practice, delivering a slower experience to real people on real phones.
These are Google's real-user field readings, the Chrome UX Report collected from actual Chrome visitors, not a lab score on fast hardware, where all of these frameworks look healthy.
## What the data covers
We detected the meta-framework on each site from HTTP Archive's technology crawl and joined it to the Chrome UX Report, Google's field record of Core Web Vitals from real Chrome users. That gave 490,000 mobile origins running Next.js, Nuxt or Astro with a field reading. A site passes [Core Web Vitals](/resources/guides/complete-core-web-vitals-guide) when it is good on all three metrics at once at the 75th percentile of its visitors: Largest Contentful Paint under 2.5 seconds, Interaction to Next Paint under 200 milliseconds, and Cumulative Layout Shift under 0.1. Measured on mobile, it is the same demanding standard Google uses to judge a page, so a passing framework is genuinely fast for most of its visitors.
## The framework that ships least JavaScript wins
On mobile, Astro sites pass Core Web Vitals 48.0% of the time. Next.js sites pass 29.3%, Nuxt sites 24.9%. That is not a rounding difference; Astro's real-world pass rate is more than 1.6 times Next.js's and roughly double Nuxt's.
It also puts Astro above the roughly 42% mobile web-wide average, while Next.js and Nuxt sit well below it. The newest entrant is the only one of the three that makes a site more likely to pass than the average website, and the reason is baked into its architecture: it sends the browser less to do.
48.0%
Astro's mobile Core Web Vitals pass rate, more than 1.6 times Next.js's 29.3% and roughly double Nuxt's 24.9%. Copy stat
Core Web Vitals pass rate by meta-framework (mobile)
Astro
48%
Next.js (App Router)
31.1%
Next.js (all)
29.3%
Nuxt.js
24.9%
Source: PageSpeed Matters analysis of 490,000 origins with CrUX field data, May 2026. Web-wide mobile average is about 42% on the same basis.
The static-first framework passes far more often than the full-hydration React and Vue ones.
Copy chart embed Download PNG
## Islands versus full hydration
As with UI frameworks generally, the decisive metric is responsiveness. Astro sites are good on [Interaction to Next Paint](/resources/data-studies/inp-device-gap) 88.9% of the time. Next.js sites only 66.3%, Nuxt sites 72.8%, both below the 82.5% web-wide average.
Next.js and Nuxt default to sending a JavaScript representation of the page to the browser and hydrating it, re-attaching interactivity to server-rendered markup. On a fast machine that is invisible. On a mid-range Android the phone has to download, parse, and execute a substantial bundle before taps feel responsive. Astro's islands architecture inverts the default: the page ships as static HTML, and only the components that genuinely need interactivity receive JavaScript. That is a 22.6-point good-responsiveness advantage over Next.js on mobile, and loading follows the same logic, with Astro good on loading for 76.7% of sites against Next.js's 54.8% and Nuxt's 48.4%.
Good responsiveness (INP) by meta-framework (mobile)
Astro
88.9%
Web-wide average
82.5%
Nuxt.js
72.8%
Next.js (all)
66.3%
Source: PageSpeed Matters analysis, mobile 75th-percentile field data, May 2026.
The framework that hydrates least is the framework that responds fastest on a phone.
Copy chart embed Download PNG
## App Router helps, desktop erases the gap
Next.js is mid-transition between its older Pages Router and the newer App Router built on React Server Components, which are designed to ship less client JavaScript. The data shows the App Router helping at the margin: 31.1% mobile pass versus 29.3% across all Next.js sites, and a clearer desktop lead of 55.8% to 52.4%. It is a real improvement, but it does not close the gap to Astro's static-first baseline.
On desktop the three converge entirely, with good-responsiveness rates between 95.7% and 97.0%. A desktop CPU chews through hydration fast enough that the architectural difference barely registers. That is the single most important caveat for anyone reading a green Lighthouse score on a laptop: it says almost nothing about how the same Next.js or Nuxt app feels on the phone in a customer's hand.
**Meta-framework**
**Mobile origins**
**CWV pass**
**Good LCP**
**Good INP**
**Good CLS**
Astro
35,500
48.0%
76.7%
88.9%
94.5%
Next.js (App Router)
220,714
31.1%
55.1%
67.5%
80.3%
Next.js (all)
353,426
29.3%
54.8%
66.3%
76.0%
Nuxt.js
102,364
24.9%
48.4%
72.8%
63.1%
SvelteKit did not reach the 30,000-origin reporting threshold this crawl. Buckets are non-exclusive.
## Choose the architecture that ships less JavaScript
If Core Web Vitals matter to you, this data points at architecture before optimization. Astro passes on 48.0% of mobile sites, Next.js on 29.3%, Nuxt on 24.9%, a 19-point spread that comes almost entirely from responsiveness: Astro is good-INP on 88.9% of sites against Next.js's 66.3%, a 22.6-point lead. The static-HTML-plus-islands model reaches passing scores in the wild far more often than full-hydration React or Vue does.
Read your Lighthouse scores on the right device. On desktop all three converge to between 95.7% and 97.0% good INP, because a laptop CPU absorbs hydration the way a mid-range Android cannot. A green score on your own machine says almost nothing about the phone in a customer's hand, so measure [Interaction to Next Paint](/resources/data-studies/inp-device-gap) on real mobile hardware.
If you are staying on Next.js or Nuxt, the gap is not fixed in stone. The App Router already lifts Next.js from 29.3% to 31.1% on mobile, so adopt the lighter-rendering paths your framework offers, partial hydration and streaming among them, and treat client-side JavaScript as a budget you spend rather than a default you inherit. The [React vs Vue vs Angular field study](/resources/data-studies/core-web-vitals-by-javascript-framework) shows the same rule at the UI-framework level: the phone rewards whatever sends it less work.
## Embed this research
Paste this on your site to embed the chart. It links back to the source automatically.
Source: Astro Passes Core Web Vitals on 48% of Sites. Next.js Manages 29.3% - PageSpeed Matters
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## Cite this study
APA Copy
Matt Suffoletto. (2026). Astro Passes Core Web Vitals on 48% of Sites. Next.js Manages 29.3%. PageSpeed Matters. https://www.pagespeedmatters.com/resources/data-studies/core-web-vitals-next-nuxt-astro
Plain link Copy
Astro Passes Core Web Vitals on 48% of Sites. Next.js Manages 29.3% - PageSpeed Matters - https://www.pagespeedmatters.com/resources/data-studies/core-web-vitals-next-nuxt-astro
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## Frequently asked questions
### Is Astro faster than Next.js and Nuxt for Core Web Vitals?
Astro Passes Core Web Vitals on 48% of Sites. Next.js Manages 29.3%.
### How was this measured?
HTTP Archive technology detection (June 2026 crawl, Wappalyzer) joined to Chrome UX Report (CrUX) field data via BigQuery (May 2026). Root-page origins running each meta-framework with a CrUX reading, measured on mobile at the 75th percentile against the strict all-three Core Web Vitals pass convention.
## Related studies
- [Frameworks The Fastest JavaScript Framework Isn't React, Vue or Angular - Alpine.js Passes 56.3% ](/resources/data-studies/core-web-vitals-by-javascript-framework)
- [Metrics INP on Mobile vs Desktop: 97.9% of Desktop Sites Pass, Only 82.5% on Mobile ](/resources/data-studies/inp-device-gap)
- [Frameworks Static Site Generators Compared: Hugo and Jekyll Hit 90% Good LCP, Next.js 29% ](/resources/data-studies/static-site-generators-core-web-vitals)
- [Frameworks 64% of the Mobile Web Still Runs jQuery, and Those Sites Are Faster ](/resources/data-studies/jquery-core-web-vitals)
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