← Insights
Web Technology
Core Web Vitals in 2026: INP, LCP, and the New Performance Baseline
INP replaced FID in 2024. Two years in, the data shows which patterns separate fast sites from forgettable ones.
Evolve Editorial · February 5, 2026 · 6 min read
INP is harsher than FID
INP measures the worst interaction over the page lifetime, not just the first. HTTP Archive data shows ~36% of mobile pages currently fail INP — a far higher failure rate than FID ever produced.
Long tasks are the enemy
The most effective INP wins come from breaking long JavaScript tasks: yielding to the main thread, deferring hydration, and shipping less client JS. Frameworks that support partial / selective hydration have a structural advantage.
LCP is now a brand metric
LCP correlates so strongly with bounce and conversion that performance teams are increasingly reporting it next to brand KPIs. Sub-2.5s LCP is the floor; sub-1.5s separates leaders.
