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    @zaasmi said in Common Lighthouse Errors and Fixes Step by Step Guide: If you’re encountering errors when using Google Lighthouse (via Google PageSpeed Insights or Chrome DevTools) to evaluate your page’s performance, it’s crucial to address the specific issues Lighthouse reports. Below are common errors and their solutions to help you achieve a higher score. Common Lighthouse Errors and Fixes? Common Lighthouse Errors and Fixes? 1. Avoid Excessive DOM Size • Error: Large DOM size can slow down page rendering. • Solution: Simplify the structure of your HTML. Avoid deeply nested elements and reduce the number of nodes. 2. Reduce Unused JavaScript • Error: Unused JavaScript increases the time it takes for a page to load. • Solution: • Only load essential JavaScript on page load. • Remove unnecessary third-party scripts or defer non-critical scripts by using defer or async attributes. • Minify JavaScript. 3. Eliminate Render-Blocking Resources • Error: Resources like CSS or JavaScript block the first paint of the page. • Solution: • Inline critical CSS for above-the-fold content. • Defer non-critical CSS and JavaScript files. • Use media="print" for print stylesheets to defer them. 4. Use Next-Gen Image Formats (e.g., WebP) • Error: Images are being loaded in formats that are not optimized. • Solution: Convert your images to modern formats like WebP or AVIF to reduce image sizes without compromising quality. 5. Serve Images in Properly Sized Resolutions • Error: Images are being loaded in sizes that are larger than they need to be. • Solution: • Use responsive images with srcset and sizes attributes. • Only serve the necessary image size based on screen resolution. 6. Ensure Text Remains Visible During Webfont Load • Error: Web fonts can cause a flash of invisible text (FOIT). • Solution: Use the font-display: swap CSS property to show fallback text until the web font is fully loaded. 7. Reduce Initial Server Response Time • Error: Long server response times can slow down the loading process. • Solution: • Optimize server-side code and database queries. • Use caching mechanisms like CDN to serve content closer to users. 8. Minimize Main-Thread Work • Error: Too much JavaScript or inefficient code execution can overload the main thread. • Solution: • Minimize JavaScript execution time. • Use Web Workers to offload complex computations. 9. Efficiently Encode Images • Error: Images are being loaded in formats that aren’t efficiently compressed. • Solution: Compress images using tools like TinyPNG, ImageOptim, or Squoosh. 10. Reduce the Impact of Third-Party Code • Error: Third-party scripts (e.g., ads, analytics) can slow down loading times. • Solution: • Defer third-party scripts or load them asynchronously. • Remove unnecessary third-party integrations. 11. Enable Text Compression • Error: Resources like HTML, CSS, and JavaScript are not being compressed. • Solution: Enable Gzip or Brotli compression on your server to reduce resource sizes. 12. Defer Offscreen Images • Error: Images that are offscreen are being loaded too early. • Solution: Implement lazy loading for images so they load only when they are about to enter the viewport. 13. Preload Key Requests • Error: Critical resources (like fonts or CSS) are not being fetched early enough. • Solution: Use <link rel="preload"> in the <head> for key resources like fonts and CSS files to prioritize loading. 14. Remove Unused CSS • Error: Unused CSS increases page size. • Solution: Audit your CSS using tools like PurgeCSS to remove unused styles. 15. Properly Size Tap Targets • Error: Tap targets (like buttons or links) are too small or too close together on mobile. • Solution: Increase the size of tap targets to at least 48px by 48px and ensure enough spacing between them for better user experience on mobile. Google Lighthouse Metrics to Focus On: 1. Performance: • Focus on improving page load speed, time to interactive (TTI), and first contentful paint (FCP). • Aim for an FCP of less than 2 seconds and TTI of under 3.8 seconds. 2. Accessibility: • Ensure semantic HTML, ARIA roles, and proper color contrast are used for accessibility. 3. Best Practices: • Make sure HTTPS is enabled, resources are served securely, and there are no vulnerable JavaScript libraries. 4. SEO: • Ensure that the page is indexable and has optimized metadata, including title tags, meta descriptions, and proper use of headers (<h1>, <h2>, etc.). 5. Progressive Web App (PWA): • If applicable, you can also focus on making your site a PWA for offline access and better user experience on mobile. Running Lighthouse Locally • Google Chrome DevTools: Open Chrome DevTools, navigate to the “Lighthouse” tab, and run the audit. • PageSpeed Insights: Use Google’s PageSpeed Insights tool for a detailed report. By resolving the above issues and focusing on performance, accessibility, and SEO, you can significantly improve your Lighthouse scores and Google PageSpeed rankings.
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