Speed 5 SLIDES

Core Web Vitals Mastery: Solving INP & LCP

An advanced technical breakdown on diagnosing and resolving Interaction to Next Paint (INP), Largest Contentful Paint (LCP), and Cumulative Layout Shift.

Engineered by Vishal Mehta • Hwt Techy
3 min story • Performance Engineers, Technical SEO Specialists, CTOs
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THE INP REQUIREMENT 1 / 3

Interaction to Next Paint (INP) Replaces FID

INP measures the worst latency of any user interaction on the page. Long-running JavaScript execution blocks the main thread and causes INP failures.

<200ms Google threshold for "Good" INP status
  • Break long tasks (>50ms) using scheduler.yield() or requestIdleCallback
  • Avoid massive DOM tree re-renders on simple form inputs
  • Debounce expensive scroll, resize, and typing handlers
VETERAN ARCHITECT TIP

Profile your interaction latency with Chrome DevTools Performance panel under 4x CPU throttling.

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LCP OPTIMIZATION 2 / 3

Sub-2.0s Largest Contentful Paint on Mobile

LCP is dominated by hero images and web font loading. High priority resource hints and pre-compressed AVIF formats solve LCP permanently.

<2.0s Mobile LCP target for 100/100 Lighthouse
  • Add fetchpriority="high" to your primary above-the-fold image
  • Preload hero assets using <link rel="preload" as="image">
  • Eliminate client-side redirects before serving HTML
VETERAN ARCHITECT TIP

Never lazy-load the above-the-fold hero image: loading="lazy" on the LCP image causes a 500ms delay.

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ZERO CUMULATIVE LAYOUT SHIFT 3 / 3

Locking Dimensions and Font Fallbacks

CLS occurs when late-loading images, web fonts, or ads shift text during reading. Pre-allocate layout dimensions to guarantee zero movement.

0.000 Target CLS score across all viewports
  • Always set aspect-ratio or explicit width/height on images
  • Use font-display: optional or size-adjust for system font matching
  • Reserve fixed min-height containers for dynamic widgets
VETERAN ARCHITECT TIP

Font swapping with font-display: swap can cause CLS; use size-adjust to match fallback x-heights exactly.

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KEY TAKEAWAY FINAL

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HWT TECHY • 10-YEAR VETERAN AGENCY
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