Website Performance Optimization: Core Web Vitals Guide

Web Performance Optimization Guide

Core Web Vitals

LCP < 2.5s

Optimize images (WebP/AVIF), inline critical CSS, font preloading, reduce server response.

INP < 200ms

Minimize JS bundles, break long tasks, use Web Workers.

CLS < 0.1

Set image dimensions, load fonts locally, reserve dynamic content space.

Next.js Tips

• next/image for automatic optimization
• dynamic() for lazy loading
• ISR for incremental regeneration

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Frequently Asked Questions

What are Core Web Vitals?

Three key metrics Google uses to measure page experience: LCP (loading speed), INP (interaction responsiveness), CLS (visual stability).

Does page speed affect SEO?

Yes, Core Web Vitals are official Google ranking factors. Slow sites see drops in both rankings and conversion rates.

How can LCP be improved?

Convert images to WebP/AVIF, inline critical CSS, reduce server response time, and use font preloading.