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Page speed optimization: cut your load time. Image optimization, caching, CDN, and best practices.
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Page speed is both an SEO ranking factor and a business metric. Fast pages rank higher on Google. Fast pages also convert more visitors into customers. Research shows that a 1-second delay in page load results in 7% fewer conversions. For ecommerce sites, slow pages cost thousands of dollars daily in lost sales. For publishers, slow pages mean fewer page views and lower ad revenue. For all sites, page speed is critical.
The benchmark for fast page load is under 2 seconds. Pages loading in 2 seconds or less are perceived as fast by users. Pages taking 3-5 seconds feel slow. Pages taking over 5 seconds are frequently abandoned. Your goal is simple: get your load time under 2 seconds, then under 1.5 seconds, then continue optimizing. Every 100ms of improvement matters.
Page load time consists of several components. Time to First Byte (TTFB) is how long the server takes to respond. Larger Contentful Paint (LCP) is when the main content becomes visible. Fully loaded is when all resources finish downloading. These metrics are not the same, and optimizing each requires different tactics.
TTFB is your server's response time. If TTFB is over 600ms, your server is slow. Common causes are inefficient backend code, database queries, or server overload. Fix TTFB by optimizing backend code, upgrading hosting, enabling caching, or using a Content Delivery Network (CDN).
Google's performance learning path explains each metric in detail. LCP and other Core Web Vitals are covered in depth. Understanding these metrics is prerequisite to optimizing page speed effectively.
Images are typically 50-80% of page weight. Unoptimized images are the fastest way to slow down your site. Optimize images by reducing file size without compromising quality. Three tactics:
Compression: Use image compression tools to reduce file size. JPEG images compress 10-40x. PNG images compress 2-5x. Use tools like TinyPNG, ImageOptim, or plugins in your CMS to automatically compress. Compress before uploading to your site.
Modern formats: Use WebP instead of JPEG or PNG. WebP compresses 25-35% better than JPEG while maintaining quality. Browsers support WebP natively now. Use JPEG as a fallback for older browsers using the `
Lazy loading: Load images only when users scroll near them. Use the native HTML `loading="lazy"` attribute on images below the fold. This defers loading images that users may never see, improving initial page load dramatically.
Google's optimization guide provides specific image optimization techniques. Properly optimized images alone often reduce page load time by 30-50%.
Render-blocking CSS and JavaScript slow down page load. Render-blocking resources prevent the browser from rendering the page until they are downloaded and processed. Defer non-critical CSS and JavaScript so critical content renders first.
Minimize and defer JavaScript: Large JavaScript files block rendering. Split your JavaScript into smaller chunks and defer loading non-critical scripts. Use `
