{"id":35,"slug":"inp-replaced-fid-march-2024","title":"INP officially replaced FID as a Core Web Vital on March 12, 2024","kind":"reference","scope":"business","status":"current","audiences":["claude-code","dev","candid-team"],"topics":["core-web-vitals"],"reference_body":"**Claim:** Interaction to Next Paint (INP) officially replaced First Input Delay (FID) as a Core Web Vital on **March 12, 2024**.\n\n**Source:** web.dev / Google, confirmed in Addy Osmani's \"History of Core Web Vitals\" — <https://addyosmani.com/blog/core-web-vitals/>\n\n**Confidence:** Verified.\n\n**Current thresholds (at p75 of real-user data):** LCP ≤ 2.5s, **INP ≤ 200ms**, CLS ≤ 0.1.\n\n**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).","rationale_body":null,"metadata":null,"links":{"outgoing":[],"incoming":[{"slug":"research-brief-marketing-sites-that-do-something","title":"Research brief: What makes a marketing site do something (piece on brochure vs platform)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"inp-150ms-target-not-200ms-floor","title":"Candid build standard: INP ≤ 150ms target (200ms is the failing floor); LCP ≤ 2.0s; CLS ≤ 0.05","kind":"rule","scope":"business","link_type":"depends-on"},{"slug":"redbus-inp-7pct-sales-2023","title":"redBus (2023): INP improved ~72% on search page → +7% sales (6-7.2% CR uplift across operating countries)","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"contentsquare-inp-2023-25pct-conversion-gap","title":"Contentsquare 2023 (n=997 customer sites): Good INP retail users converted 2.5% vs 2.0% for Poor (25% relative lift); +45% on desktop","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"nextjs-cwv-10pp-drop-fid-to-inp-transition","title":"Next.js suffered a 10 percentage-point CWV drop when FID was replaced by INP (March 2024) — \"modern stack\" is not synonymous with \"fast\"","kind":"reference","scope":"business","link_type":"depends-on"}]},"created_at":"2026-05-22T18:57:39.613Z","updated_at":"2026-05-22T18:57:39.613Z"}