Core Web Vitals in 2026: What Still Matters
LCP, INP, CLS — plus the newer metrics that quietly moved the goalposts. A practical playbook for fast sites in 2026.
Core Web Vitals aren't going away — they're getting stricter. Here's the 2026 playbook.
LCP is still about images
Nine times out of ten, LCP is a hero image. Serve modern formats (AVIF/WebP), size images to viewport, and preload the LCP resource.
INP replaced FID for a reason
Users can feel jank. Break up long tasks, defer non-critical JS, and lean on React 19 features like the compiler and useTransition.
CLS is a design problem disguised as an engineering problem
Reserve space for images, embeds, and fonts. Font-display: optional or swap with matching metrics keeps layout stable.
The quiet new metric: TTFB
Edge everything you can. Even the fanciest frontend loses to slow origins.
Fast sites aren't magic. They're the accumulation of a hundred small decisions made in the right direction.