Lighthouse score is a tool developed by Google to evaluate web page quality, mainly covering performance, accessibility, SEO and other aspects. 1. Performance score measures loading speed and responsiveness, pay attention to indicators such as FCP, TTI, LCP, etc., and can improve by optimizing images, reducing JS, and using caches; 2. Accessibility score checks whether it is suitable for disabled users, and pays attention to contrast, alt text, semantic HTML and keyboard operations; 3. SEO scores examine search engine friendliness, including meta tags, title structure, robots.txt and sitemap.xml configuration; 4. Best practice scores involve HTTPS, API usage and CSS specifications; 5. PWA scores focus on installation, offline support and responsive design, and ensure that Service Worker and manifest files are complete. Regular checking of ratings can help continuously optimize website performance.
Lighthouse scores are a set of performance metrics generated by Google's Lighthouse tool, which is built into Chrome DevTools. It helps developers evaluate the quality of web pages across several key areas like performance, accessibility, SEO, and more.
What Do the Scores Mean?
Each Lighthouse score ranges from 0 to 100 — higher is better. These scores aren't just for show; they reflect how well your site performs in real-world scenarios and how it aligns with best practices. Think of them as a report card for your website.
Performance Score: How Fast Does Your Page Load?
This one usually gets the most attention. The performance score measures things like load time, how quickly content becomes visible, and how responsive the page is to user interaction.
- Key metrics include First Contentful Paint (FCP), Time to Interactive (TTI), and Largest Contentful Paint (LCP).
- What you can do : Optimize images, reduce server response time, and minimize JavaScript. Caching also helps a lot.
- A common issue is loading too many assets at once. Try deferring non-critical scripts or using lazy loading.
Accessibility Score: Is Your Site Usable for Everyone?
This checks whether your site works well for people using screen readers or other assistive technologies.
- Use proper contrast ratios, alt text for images, and semantic HTML.
- Avoid relying only on color to convey information.
- One often-overlooked item is making sure all interactive elements are keyboard-accessible.
SEO Score: Will Search Engines Like Your Page?
It looks at basic SEO best practices such as meta tags, image alt attributes, mobile-friendliness, and crawlability.
- Make sure each page has a unique title and meta description.
- Use header tags properly (H1, H2, etc.) to structure content.
- Don't forget to check if your site has a robots.txt file and sitemap.xml configured.
Best Practices and PWA Scores
These cover general coding standards and Progressive Web App features.
- Best Practices score checks things like HTTPS usage, avoiding deprecated APIs, and correct use of CSS.
- PWA score looks at installability, offline support, and responsive design.
- For PWAs, make sure your service worker is caching effectively and your manifest file is complete.
If you're building or maintaining a website, checking Lighthouse scores regularly give you actionable insights. You don't need to hit 100 in every category right away, but aiming to improve over time makes a big difference.
Basically that's it.
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