How to Improve Your Lighthouse Performance Score

A low Lighthouse performance score usually means your page is slow to load, slow to become interactive, or visually unstable. The good news is that most performance issues have straightforward fixes. Here are the most impactful things you can do. Optimize your images. Images are often the largest assets on a page. Use modern formats like WebP or AVIF, compress them appropriately, and serve different sizes for different screen widths using the srcset attribute. Lazy-load images that are below the fold so they don't block the initial render. Minimize and defer JavaScript. Large JavaScript bundles are one of the biggest performance killers. Split your code into smaller chunks, defer non-critical scripts, and remove unused code. If you are using a framework like Next.js or React, take advantage of dynamic imports and tree shaking to reduce bundle size. Reduce server response time. Your Time to First Byte (TTFB) depends on your server and hosting setup. Use a CDN to serve assets from locations closer to your users. Enable caching headers so repeat visitors don't re-download the same resources. Consider server-side rendering or static generation for content-heavy pages. Eliminate render-blocking resources. CSS and JavaScript files in the head of your document can block the browser from rendering anything until they finish loading. Inline critical CSS, defer non-critical stylesheets, and use the async or defer attributes on script tags. Fix Cumulative Layout Shift. Layout shifts happen when elements on the page move around as it loads. The most common causes are images without explicit width and height attributes, ads or embeds that load late, and web fonts that cause text to reflow. Set explicit dimensions on media elements and use the font-display: swap CSS property. Preload key resources. Use link rel="preload" for fonts, hero images, and other critical assets. This tells the browser to start downloading them early, before it discovers them naturally in the HTML. Monitor regularly. Performance is not a one-time fix. New features, third-party scripts, and content changes can all introduce regressions. Use Lightbucket to schedule automatic Lighthouse audits and catch issues before they affect your users. Tracking your scores over time helps you understand the impact of each change and maintain a consistently fast experience. Start with the items that have the biggest impact on your specific score, Lighthouse highlights the opportunities and diagnostics that matter most for your page.