Core Web Vitals in 2026: A Practical Guide to a 95+ Lighthouse Score
INP replaced FID, and the bar for fast keeps rising. Here's the exact playbook we use to ship sites that consistently hit green Core Web Vitals.
Aditya Verma
Principal Engineer
Core Web Vitals are now a confirmed ranking factor and, more importantly, a proxy for real user happiness. In this guide we break down LCP, INP and CLS, then walk through the concrete techniques — image optimization, font strategy, code splitting, streaming SSR and edge caching — that take a typical site from yellow to green.
We cover how to measure correctly with field data (CrUX) versus lab data (Lighthouse), why your '100' in the lab can still fail in the wild, and how to set a performance budget that survives feature growth.
Written by
Aditya Verma
Principal Engineer
Aditya Verma is part of the SUBZONE team, sharing lessons from building production software for clients worldwide.