Why do 80% of WordPress sites have Core Web Vitals issues? LCP (Largest Contentful Paint), INP (Interaction to Next Paint), CLS (Cumulative Layout Shift) – metrics Google includes in ranking. Most WordPress sites fail them. Here are typical causes and solutions.

LCP – Slow Loading

Cause: large unoptimized images, weak hosting, render-blocking CSS/JS. Solution: WebP/AVIF, lazy load, CDN (Cloudflare), caching (WP Super Cache, LiteSpeed), good hosting (VPS/managed). Hero image must be optimized – often the main LCP element.

INP – Interaction Delays

Cause: heavy JavaScript, plugins loading on frontend. Solution: minimize JS, use deferred/async, disable unnecessary scripts. Check plugins – many "load everywhere" by default.

CLS – Layout Shift

Cause: images without dimensions, ads, asynchronously loading fonts. Solution: width/height on img, reserve space for ads, font-display: swap with fallback. Check PageSpeed Insights for which element "jumps."

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