Page Speed
Page speed is the measurement of how quickly a web page's content loads and becomes interactive, typically measured by metrics like Time to First Byte (TTFB), First Contentful Paint (FCP), and Largest Contentful Paint (LCP).
Page speed directly impacts Core Web Vitals and is a confirmed Google ranking factor. Slow pages have higher bounce rates — a 1-second delay can reduce conversions by 7%.
Key optimization strategies: serve images in modern formats (WebP/AVIF) with proper sizing, minimize JavaScript bundles, use code splitting, leverage CDN caching, enable gzip/brotli compression, and preload critical resources.
Measure with Lighthouse (lab data) and PageSpeed Insights (field data from CrUX). Focus on field data for SEO impact — lab results can differ significantly from real-user performance. Next.js provides built-in optimizations like automatic code splitting, image optimization, and font optimization.
Related terms
Core Web Vitals
Core Web Vitals are a set of three Google metrics — Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — that measure real-world user experience.
Mobile-First Indexing
Mobile-first indexing means Google predominantly uses the mobile version of a website's content for indexing and ranking, rather than the desktop version.
Technical SEO
Technical SEO encompasses the server-side and infrastructure optimizations that help search engines efficiently crawl, render, index, and rank your website's content.
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