Website Performance Guide: Speed Up Your Site in 30 Minutes
53% of mobile visitors leave if a page takes longer than 3 seconds to load. Every second counts — here's how to fix it fast.
Measure Before You Optimize
Run Google PageSpeed Insights, GTmetrix, and WebPageTest. Note your LCP, CLS, and INP scores. Test both mobile and desktop. Set a baseline before making changes.
Image Optimization (Biggest Win)
Images account for 50%+ of page weight. Convert to WebP format (30% smaller than JPEG). Resize to display size (don't serve 4000px images in 400px containers). Use lazy loading for below-fold images.
Minimize Render-Blocking Resources
Defer non-critical JavaScript. Inline critical CSS. Remove unused CSS and JS. Use async/defer attributes on script tags. Fonts: use font-display: swap to prevent invisible text.
Leverage Browser Caching
Set cache headers for static assets (images, CSS, JS) to 1 year. Use versioned filenames for cache busting. CDN caching reduces server load and global latency.
Use a CDN
A Content Delivery Network serves assets from the closest server to the user. Reduces latency by 50-70% for global visitors. Most CDNs also provide DDoS protection and SSL.
Server-Side Optimizations
Enable GZIP/Brotli compression (reduces transfer size by 70%). Use HTTP/2 for multiplexing. Database query optimization. Server response time should be under 200ms (TTFB).
Performance & Revenue
Amazon found that 100ms of latency cost them 1% in sales. Google penalizes slow sites in rankings. Fast sites convert 2x better than slow ones. Performance is a revenue lever, not a vanity metric.
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