Core Web Vitals Explained: The 2026 Cheat Sheet for Developers
Global Orbit Team Oct 2, 2025 4 min read
PageSpeed Insights showing passing Core Web Vitals scores
Core Web Vitals Explained: 2026 Cheat Sheet
Core Web Vitals are Google's three signals of page experience. They are ranking factors — and they directly affect bounce rate and conversions.
LCP (Largest Contentful Paint)
Measures loading performance. Target: under 2.5s at the 75th percentile.
- Preload hero images and fonts
- Serve responsive images with proper width/height
- Avoid render-blocking JS/CSS
INP (Interaction to Next Paint)
Replaced FID in 2024. Measures responsiveness. Target: under 200ms.
- Break up long tasks
- Debounce heavy event handlers
- Use content-visibility: auto for below-the-fold sections
CLS (Cumulative Layout Shift)
Measures visual stability. Target: under 0.1.
- Always set width/height on images & ads
- Avoid injecting content above existing content
- Reserve space for fonts with font-display: swap
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Frequently Asked Questions
What are the 2026 Core Web Vitals targets?
LCP under 2.5s, INP under 200ms, and CLS under 0.1 at the 75th percentile of real-user traffic.
Is INP the same as FID?
No. INP replaced FID in March 2024 and measures all interactions during a page visit, not just the first one.