Lighthouse.
Google's open-source tool that grades a webpage on speed, accessibility, SEO, and best practices.
Lighthouse is the audit tool built into Chrome DevTools (and at pagespeed.web.dev). It runs your site against a checklist and returns four 0 to 100 scores: Performance, Accessibility, Best Practices, and SEO.
Score targets for a healthy small-business site: 80+ on mobile Performance, 95+ on Accessibility and Best Practices, 100 on SEO. The SEO score is the easiest to ace · it's mostly checking that you have title tags, meta descriptions, valid schema, and a robots.txt.
Lighthouse uses a simulated slow connection, so the numbers are usually worse than what real visitors experience. Don't obsess over the exact score · fix the actionable items it flags.
Pairs with these.
- Core Web Vitals (CWV)Google's three-number summary of how fast and stable your website actually feels.
- Largest Contentful Paint (LCP)How long it takes for the main content of your page to appear. Google cares a lot about this number.
- Cumulative Layout Shift (CLS)A score for how much content jumps around as your page loads. Lower is better.
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