Website speed is a confirmed Google ranking factor and directly impacts user experience, conversion rates, and bounce rates. A 1-second delay in load time can reduce conversions by 7%. Here are 15 proven techniques to make your site faster.
1. Optimize Images
Images are often the largest files on a webpage. Optimizing them can dramatically reduce page weight.
- Use modern formats: WebP and AVIF are 25-50% smaller than JPEG/PNG
- Resize images: Serve the exact dimensions needed, not larger
- Compress: Use tools like Squoosh, ImageOptim, or ShortPixel
- Set explicit dimensions: Always include width and height attributes
2. Implement Lazy Loading
Lazy loading defers loading of off-screen images and iframes until the user scrolls near them. Add loading="lazy" to images below the fold. Never lazy-load your hero/LCP image.
3. Use a CDN
A Content Delivery Network (CDN) serves your assets from edge servers worldwide, reducing latency for users far from your origin server. Popular options include Cloudflare, Fastly, and Vercel Edge Network.
4. Enable Browser Caching
Set proper cache headers so returning visitors don't re-download unchanged assets. Use Cache-Control: public, max-age=31536000, immutable for versioned static assets (JS, CSS, images with hashes).
5. Minify CSS, JavaScript & HTML
Minification removes whitespace, comments, and unnecessary characters. Most build tools (Webpack, Vite, Next.js) do this automatically for production builds.
6. Code Splitting & Tree Shaking
Don't send all your JavaScript at once. Split code by route so users only download what they need. Tree shaking removes unused code from your bundles.
7. Optimize Web Fonts
- • Use
font-display: swapto prevent invisible text during font loading - • Preload critical fonts with
<link rel="preload"> - • Subset fonts to include only characters you actually use
- • Use variable fonts to reduce the number of font files
8. Enable Gzip/Brotli Compression
Text-based assets (HTML, CSS, JS, SVG) can be compressed by 60-80% with Gzip or Brotli. Most hosting providers and CDNs enable this by default. Brotli offers 15-25% better compression than Gzip.
9. Inline Critical CSS
Extract and inline the CSS needed for above-the-fold content directly in the HTML. This eliminates render-blocking CSS requests for the initial view.
10. Audit Third-Party Scripts
Third-party scripts (analytics, chat widgets, social embeds) are often the biggest performance killers. For each script, ask: is this worth the performance cost? Defer non-essential scripts and load them after user interaction.
11. Use Preconnect & DNS Prefetch
Speed up connections to third-party domains by adding preconnect hints in your HTML head. This saves 100-300ms per external request.
12. Implement Server-Side Rendering (SSR)
SSR generates HTML on the server instead of the client, reducing Time to First Byte and improving perceived load speed. Frameworks like Next.js, Nuxt, and Remix make this straightforward.
13. Optimize Database Queries
Slow database queries directly impact server response time (TTFB). Add proper indexes, avoid N+1 queries, and implement query caching for frequently accessed data.
14. Use HTTP/2 or HTTP/3
HTTP/2 enables multiplexing (multiple requests over one connection), header compression, and server push. HTTP/3 adds even faster connection setup using QUIC. Most modern hosting providers support both.
15. Monitor Performance Continuously
Speed optimization is not a one-time task. Set up performance monitoring to catch regressions. Use tools like Google PageSpeed Insights, Lighthouse CI, and real user monitoring (RUM).
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