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.

Interaction to Next Paint measures responsiveness across the visit

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
The three Core Web Vitals Google ranks on.

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.

Image, JS, CSS analyzed file-by-file

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

Performance is the foundation
