Speed is no longer optional—it directly influences search rankings and conversion rates. With Google's INP metric, websites must guarantee instant responsiveness to every user click and tap under 200ms.
The 3 Pillars of Core Web Vitals
- LCP (Largest Contentful Paint): Target < 2.5s for hero media rendering.
- INP (Interaction to Next Paint): Target < 200ms interaction latency.
- CLS (Cumulative Layout Shift): Target < 0.1 visual stability score.
Actionable Optimization Checklist
- Preload above-the-fold hero images with modern next/image priority tags.
- Defer non-critical third-party analytics via
lazyOnloadscripts. - Break long JavaScript execution tasks to keep the browser main thread idle and responsive.
