A real Lighthouse lab run, desktop and mobile
LCP, CLS, TBT, Speed Index, and TTFB, measured on both a desktop profile and a 375px mobile viewport - with fixes written for the framework Scanverra detects on your page.
Run free performance auditEvery metric, measured
The six signals that make up your performance score.
Largest Contentful Paint (LCP)
How long the biggest visible element takes to render. Google's Core Web Vital for loading speed.
Cumulative Layout Shift (CLS)
How much visible content jumps around as the page loads. Scored directly from Lighthouse's numeric CLS value.
Total Blocking Time (TBT)
How long the main thread is blocked by JavaScript during load - the lab-measurable proxy for real-world interaction delay.
Time to First Byte (TTFB)
How long the server takes to respond before any rendering can start - a server/hosting/CDN signal, not a frontend one.
Speed Index
How quickly the page's content is visually populated, frame by frame, not just when it finishes.
Render-blocking resources
CSS and synchronous scripts that delay first paint, flagged individually so you know exactly what to defer or inline.
How it works
Two full passes, one scan.
Desktop pass
A full Lighthouse run under desktop network and CPU conditions.
Mobile pass
The same page, re-tested at a 375px viewport with throttled conditions - mobile and desktop scores often diverge significantly.
Framework-aware fixes
Scanverra detects your stack first, so a Next.js site gets next/image and priority-loading guidance, not generic "optimize your images" advice.
Frequently asked questions
Is this lab data or real-user (field) data?
Lab data by default - a controlled, repeatable Lighthouse run on Scanverra's own infrastructure. When available, a PageSpeed Insights fallback layer can add real Chrome User Experience Report (CrUX) field data alongside it, so you can compare a controlled test against how real visitors actually experienced your site.
Why do my desktop and mobile scores differ so much?
Different network and CPU throttling profiles, plus a narrower 375px viewport that can trigger layout issues invisible on desktop. A site heavy on unoptimized images or third-party scripts typically loses more points on mobile.
Does a 100 performance score mean my site is fully optimized?
It means the specific metrics Lighthouse measures are in good shape on the tested page, under the tested conditions. It doesn't cover every possible performance factor (e.g. server response time under real load, CDN edge coverage) - treat it as a strong signal, not an absolute guarantee.
Can I test more than one page?
Yes - run the audit again with a different URL. Each scan is independent, so you can spot-check your homepage, a product page, and a blog post separately rather than assuming one page represents the whole site.
Related audits
Website Audit
Run a free instant audit for performance, SEO, accessibility, and best practices.
SEO Audit
Check crawlability, metadata, structured data, and AI-agent discoverability.
Accessibility Audit
See exactly which WCAG 2.1/2.2 success criteria your site fails, and why.
Security Audit
Turn a header/vulnerability scan into SOC 2 and GDPR control evidence.
Website Speed Test
How fast your site loads, in plain language - one number, no jargon.
Core Web Vitals Test
Check LCP, CLS, and INP against Google's thresholds, lab and field.
Broken Link Checker
Crawl a page's links and find the ones that are dead before your users do.
Security Headers Checker
CSP, HSTS, and every other HTTP security header - analyzed, not just listed.
Open Graph Checker
See whether your page has the og:title, og:description, and og:image tags social platforms need.
Schema Markup Checker
Check whether your page ships JSON-LD structured data search engines and AI agents can read.
Sitemap Checker
Check whether your sitemap.xml is reachable, valid, and free of common mistakes.
Redirect Checker
Trace a URL's redirect chain and catch loops, excess hops, and HTTPS-to-HTTP downgrades.
Related reading
Core Web Vitals in 2026: A Practical Guide to Faster Websites
What LCP, INP, and CLS actually measure, why they affect your Google ranking, and a prioritized checklist to fix them.
The Complete Pre-Launch Website Checklist (40+ Things to Check)
Performance, SEO, accessibility, security, and code quality - everything worth checking before you point a domain at production.
Run a free performance audit
Desktop and mobile, every Core Web Vital, with framework-aware fixes.
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