Page Speed Optimization Best Practices for SEO
Page speed is a confirmed Google ranking factor. Learn how to optimize Core Web Vitals and page load times for better search performance.
Key Takeaways
- Google's ranking signal uses three metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift).
- Images are typically the largest page elements.
- CSS and synchronous JavaScript block page rendering.
- Set appropriate Cache-Control headers.
- Custom fonts can block text rendering.
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Core Web Vitals
Google's ranking signal uses three metrics: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift). Good scores are LCP < 2.5s, INP < 200ms, and CLS < 0.1.
Image Optimization
Images are typically the largest page elements. Convert to WebP/AVIF, resize to display dimensions, use responsive srcset, and lazy-load below-fold images. This alone can improve LCP by 1-3 seconds.
Render-Blocking Resources
CSS and synchronous JavaScript block page rendering. Inline critical CSS in , defer non-critical CSS, and add defer or async to script tags. Move third-party scripts to page bottom.
Caching Strategy
Set appropriate Cache-Control headers. Static assets (CSS, JS, images) can be cached for a year with content-hash filenames. HTML pages should use shorter cache periods or no-cache with ETag validation.
Font Loading
Custom fonts can block text rendering. Use font-display: swap to show text immediately with fallback fonts. Subset fonts to include only needed characters. Preload critical fonts with .
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