# Two years of INP — Core Web Vitals have settled

*2026-03-09 · Performance*

> Interaction to Next Paint replaced FID two years ago. The current Core Web Vitals trio — LCP, INP, CLS — is now stable and worth re-baselining against.

**What changed.** It's two years since **Interaction to Next Paint (INP)** replaced FID
as a Core Web Vital (March 2024). The current trio is settled: **LCP** (loading), **INP**
(responsiveness), and **CLS** (visual stability). INP is the stricter successor — it
measures latency across *all* interactions, not just the first.

**Why it matters.** INP punishes heavy JavaScript more than FID ever did, which makes it
a quiet ally of AI-readiness: the lean, server-rendered substrate that engines parse
cleanly is also the one that scores well on INP. A good INP and a clean DOM tend to come
from the same discipline.

**What to do.** Re-baseline your top templates against the current trio — a target of
INP ≤ 200ms is "good." If a page is failing INP, the usual culprit is too much
client-side JavaScript; trimming it helps users, vitals, and crawlers at once.

*Tracking: Core Web Vitals, INP, LCP, CLS.*