Phase 1. Performance. Real Core Web Vitals, measured on your live page.

LCP, INP, and CLS, the three metrics Google actually uses to rank your site. SchemaReports measures all three on the live page and tells you exactly which elements are dragging them down. Free audit includes Phase 1 and all 11 other phases.

Phase 1 Performance. Core Web Vitals on the live page

Live Core Web Vitals measurement
Live measurement

Lab and field metrics, no extension required

Phase 1: Performance

Real Core Web Vitals on the live page, plus resource-by-resource breakdown of what is slowing the site down. Results in 2–5 minutes.

  • LCP measured live, the big paint event
  • INP measured live, replaced FID March 2024
  • CLS measured live, layout shift tracking
Check Your Site

The three Core Web Vitals Google ranks on.

LCP, INP, CLS measured live
LCP, INP, CLS

Three metrics, scored against Google's thresholds

Largest Contentful Paint

Core Web Vitals are three metrics Google uses to measure page experience: LCP (how fast main content loads), INP (how quickly the page responds to user interaction), and CLS (how stable the layout is). Google uses these as ranking signals. Sites that fail Core Web Vitals can lose rankings even if their content is solid.

  • How long until your main content shows.
  • INP under 200ms = good, over 500ms = poor
  • Usually fixed by optimizing hero images and fonts.
Resource breakdown by file type
Resource breakdown

Image, JS, CSS analyzed file-by-file

Interaction to Next Paint

How responsive your page is to taps and clicks. Target under 200ms. Usually a JavaScript problem. Replaced FID in March 2024.

  • How responsive your page is to taps and clicks.
  • Target under 200ms.
  • Usually a JavaScript problem.
Mobile-first performance scoring
Mobile-first scoring

Tested under throttled mobile network conditions

Cumulative Layout Shift

Mobile is over 60% of web traffic and the slowest experience on most sites. We score mobile Core Web Vitals separately from desktop, simulate slow networks, and flag mobile-specific issues like tap target size and viewport configuration.

  • How much your layout jumps around while loading.
  • Target under 0.1.
  • Usually caused by unoptimized images, ads, or web fonts.

What Phase 1 actually checks on your site.

Not simulated. Not a cache. SchemaReports pulls your live HTML and measures Core Web Vitals the same way Chrome would.

  • Not simulated.
  • Not a cache.
  • SchemaReports pulls your live HTML and measures Core Web Vitals the same way Chrome would.

When your LCP is slow, the report tells you which element is the LCP candidate. When your CLS is bad, it tells you which element shifted. No guessing.

  • When your LCP is slow, the report tells you which element is the LCP candidate.
  • When your CLS is bad, it tells you which element shifted.
  • No guessing.

Every finding comes with a specific recommendation. Not improve your performance, actual specific guidance tied to what is wrong.

  • Every finding comes with a specific recommendation.
  • Not improve your performance, actual specific guidance tied to what is wrong.
  • Suggests async loading or removal for non-critical tools

First audit on ZolukoWeb caught 400+ images returning 403 errors. The site scored a D on Phase 1. Fixed the images, next audit scored an A.

  • First audit on ZolukoWeb caught 400+ images returning 403 errors.
  • The site scored a D on Phase 1.
  • Fixed the images, next audit scored an A.
Run Your Free Audit

What the Phase 1 report delivers.

  • Live-measured LCP, INP, CLS with A–F grade Real values from the live page, scored on Google's targets.
  • Every slow element identified by selector Hand it to your developer with the exact element to fix.
  • Specific fix recommendations per finding Not generic advice. Tied to your actual page content.
  • Included on every audit, free or paid Phase 1 runs at every tier.
Your audit deliverable

Score, breakdown, file-level findings, fix list

Run a real performance check

Free performance audit. Core Web Vitals scoring, resource analysis, and prioritized fixes. 2–5 minutes.

Performance
CORE WEB VITALS
LCP ? 6.8 s
0s 2.5s 4s+
FCP ? 4.1 s
0s 1.8s 3s+
CLS ? 0.003
0 0.1 0.25+
TBT ? 380 ms
0ms 200ms 600ms+

Common questions about performance auditing

Are these measurements real or simulated?

Core Web Vitals are three metrics Google uses to measure page experience: LCP (how fast main content loads), INP (how quickly the page responds to user interaction), and CLS (how stable the layout is). Google uses these as ranking signals. Sites that fail Core Web Vitals can lose rankings even if their content is solid.

  • SchemaReports fetches your live page.
  • INP measures responsiveness - should be under 200ms
What about FID?

FID was retired by Google in March 2024 and replaced by INP. SchemaReports measures INP.

  • FID was retired by Google in March 2024 and replaced by INP.
  • SchemaReports measures INP.
Why is TBT not a Core Web Vital?

TBT is a lab metric. INP is the field metric Google actually ranks on.

  • TBT is a lab metric.
  • INP is the field metric Google actually ranks on.
Can I track Performance scores over time?

Yes, on Pro, Multi-Business, or Agency plans with biweekly auto-refresh.

  • Yes, on Pro, Multi-Business, or Agency plans with biweekly auto-refresh.
  • Over 60% of traffic is mobile - optimization is critical
What platform does my site need to run on?

Any. Phase 1 works on WordPress, Webflow, Shopify, custom builds, everything.

  • Phase 1 works on WordPress, Webflow, Shopify, custom builds, everything.
  • Fix by using async/defer attributes or inlining critical CSS

  • Test after site changes or updates
  • Pro tier includes biweekly automatic monitoring

Run Free Audit

Run Your Free Audit

Run a real performance audit on your site.

Free, 2–5 minutes. Core Web Vitals scoring, resource analysis, and prioritized fixes.

  • The only audit that checks Psychology, Trust, and AI Readiness
  • 12 phases, 1,000+ data points, results in under 5 minutes
  • Free to run, free to download, yours to keep forever
Find out where your Core Web Vitals stand
Phase 1 of 12

Performance is the foundation