Core Web Vitals 2026 Checklist

The updated CWV targets (INP replaces FID) with fast fixes.

✅ 100% free✅ No signup✅ Runs in your browser✅ No data sent to servers

Output

Core Web Vitals 2026 targets:

LCP  ≤ 2.5s   Largest Contentful Paint
INP  ≤ 200ms  Interaction to Next Paint (replaced FID)
CLS  ≤ 0.1    Cumulative Layout Shift
TTFB ≤ 800ms  Time to First Byte
FCP  ≤ 1.8s   First Contentful Paint

Fast wins:
- Preload the LCP image with fetchpriority="high"
- Reserve width/height on every <img> and <iframe>
- Defer non-critical JS with type="module"
- Serve modern formats (AVIF > WebP > JPG)
- Font: font-display: swap + preload woff2
- Cache-Control: public, max-age=31536000, immutable on hashed assets

Why this tool survives the ChatGPT era

AI crawlers penalize slow pages — CWV directly gates AI citation eligibility.

Frequently asked

INP vs FID?

INP measures every interaction, not just the first. Stricter.

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