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Performance

Response time charts and uptime metrics for your monitors

Mobile vs desktop Web Vitals comparison

Run PageSpeed Insights for both devices in parallel and see all six Core Web Vitals side-by-side with gap analysis and remediation hints.

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LCP / FCP / TTFBCore Web Vitals metrics
Performance ScoreLighthouse 0–100 score
WaterfallResource loading waterfall
Mobile + DesktopAnalysis for both device types

Why teams trust us

CWV
Core Web Vitals
0-100
Lighthouse Score
Mobile
+ Desktop analysis
Free
no limits

How it works

1

Enter page URL

2

Lighthouse analyses

3

Get CWV and recommendations

Why does site performance matter?

Site speed directly impacts search rankings (Google CWV), conversion, and user retention. 53% of mobile users leave if a page takes more than 3 seconds to load.

Core Web Vitals

LCP, FID/INP, CLS — three key UX metrics used by Google in ranking.

Lighthouse Score

Comprehensive Performance, Accessibility, Best Practices, SEO score.

Detailed Tips

Specific fixes with estimated performance improvement.

Mobile + Desktop

Separate scores for mobile and desktop devices.

Who uses this

SEO

CWV optimization for Google

Developers

performance debugging

Marketers

conversion depends on speed

DevOps

performance monitoring

Common Mistakes

Optimizing only DesktopGoogle uses mobile-first indexing. Mobile Performance matters more than desktop.
Ignoring LCPLCP (Largest Contentful Paint) > 2.5s — ranking signal. Optimize the hero image.
Not compressing imagesImages without WebP/AVIF are the most common cause of poor LCP.
Render-blocking JS/CSSSynchronous JS in blocks rendering. Use defer/async.

Best Practices

Target CWV valuesLCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1 — Google's "green" zone.
Use a CDNCDN reduces TTFB and LCP for users far from the server.
Enable gzip/brotliCompression reduces HTML/CSS/JS size 5–10x.
Monitor CWV with RUMReal User Monitoring (RUM) collects real CWV from actual users.

Monitor performance automatically

RUM collects real CWV from users — know about degradation first.

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