Mastering Core Web Vitals: solving INP and LCP bottlenecks in production
Practical analysis of FID replacement with INP (Interaction to Next Paint), Long Task decomposition and critical rendering path optimization.
The industry-wide shift from FID to INP (Interaction to Next Paint) changed how user responsiveness is measured in the field across all web platforms.
1. What Drives Poor INP?
Heavy third-party JavaScript tracking tags and poorly scheduled main thread work block user interactions. Splitting Long Tasks with scheduler.yield() and prioritizing critical UI updates restores smooth interaction.
• LCP (Largest Contentful Paint): ≤ 2.5 s (Good)
• CLS (Cumulative Layout Shift): ≤ 0.1 (Good)
2. LCP Optimization Strategies
Preloading hero resources with fetchpriority="high" and serving modern formats (AVIF/WebP) reduces Largest Contentful Paint to sub-second benchmarks.
Lucas Antignani Rizzieri
SEO & Growth SpecialistGraduated from FIAP in Digital Marketing & Data Science (GPA 8.88/10). Specialist in Programmatic SEO, Statistical CRO, CRM ecosystems and Organic Demand Engineering.
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