MODULE 7/8
Web, UX & Core Web Vitals 2026
FID is dead since March 2024. INP under 200 ms, or you drop in Google.
Checklist
Tools we actually use:
Google PageSpeed Insights
Running on Lighthouse 13 with new Performance Insights since October 2025.
Chrome DevTools → Performance Insights
Built into Chrome. Shows exactly what blocks the main thread and ruins INP.
axe DevTools
Accessibility checker right in the browser. WCAG 2.2 compatible.
WebPageTest
Testing on real devices, not simulation. Multiple locations and networks.