core-web-vitals
Core Web Vitals
Performance optimization for Google's Core Web Vitals - LCP, INP, CLS with 2026 thresholds.
Core Web Vitals Thresholds (2026)
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| LCP (Largest Contentful Paint) | ≤ 2.5s | ≤ 4.0s | > 4.0s |
| INP (Interaction to Next Paint) | ≤ 200ms | ≤ 500ms | > 500ms |
| CLS (Cumulative Layout Shift) | ≤ 0.1 | ≤ 0.25 | > 0.25 |
Note: INP replaced FID (First Input Delay) in March 2024 as the official responsiveness metric.
Upcoming 2026 Stricter Thresholds (Q4 2025 rollout)
| Metric | Current Good | 2026 Good |
|---|---|---|
| LCP | ≤ 2.5s | ≤ 2.0s |
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