INP officially replaced FID as a Core Web Vital on March 12, 2024
Created 2026-05-22
Claim: Interaction to Next Paint (INP) officially replaced First Input Delay (FID) as a Core Web Vital on March 12, 2024.
Source: web.dev / Google, confirmed in Addy Osmani's "History of Core Web Vitals" — https://addyosmani.com/blog/core-web-vitals/
Confidence: Verified.
Current thresholds (at p75 of real-user data): LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1.
Pass rates (2025 Web Almanac / CrUX): 48% of mobile origins pass all three; 62% pass LCP; 77% pass INP; 81% pass CLS. INP is the easiest single CWV to pass; LCP is the hardest. Candid sites should aim for green on all three — the easy wins are INP (good defaults) and CLS (reserve dimensions on images); LCP is the discipline (image weight, font loading, render-blocking JS).
Referenced by (5)
- reference Research brief: What makes a marketing site do something (piece on brochure vs platform) relates-to
- rule Candid build standard: INP ≤ 150ms target (200ms is the failing floor); LCP ≤ 2.0s; CLS ≤ 0.05 depends-on
- reference redBus (2023): INP improved ~72% on search page → +7% sales (6-7.2% CR uplift across operating countries) depends-on
- reference Contentsquare 2023 (n=997 customer sites): Good INP retail users converted 2.5% vs 2.0% for Poor (25% relative lift); +45% on desktop depends-on
- reference Next.js suffered a 10 percentage-point CWV drop when FID was replaced by INP (March 2024) — "modern stack" is not synonymous with "fast" depends-on