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Core Web Vitals 2026: Fix Interaction to Next Paint
Interaction to Next Paint (INP) is the hardest Core Web Vital to pass, with ~40% of mobile origins still failing in 2026. This guide covers diagnosing INP using the web-vitals attribution build and Chrome DevTools, then fixing it through four main strategies: breaking long tasks with scheduler.yield() (with a setTimeout fallback), optimizing event handlers by deferring non-visual work via requestIdleCallback or Web Workers, eliminating layout thrashing by batching DOM reads and writes, and controlling third-party scripts with facades and dynamic imports. Includes working code examples for each technique and a 10-step optimization checklist.
