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Glossary

Lighthouse

Google's open-source tool for auditing web pages on performance, accessibility, best practices and SEO.

Definition

Lighthouse is an open-source tool from Google (built into Chrome DevTools and PageSpeed Insights) that audits a web page against four categories — Performance, Accessibility, Best Practices and SEO — producing scores out of 100 plus actionable recommendations. Lighthouse runs synthetic tests in a controlled environment; Core Web Vitals are the same metrics measured against real user traffic.

Why it matters

Lighthouse is the quickest sanity check on a site's performance and SEO posture. Sub-50 Lighthouse on mobile is a red flag. 90+ on a marketing site is now table stakes — and absolutely achievable on Next.js with the right setup.

See also

Core Web Vitals

Google's standardised performance metrics: LCP (loading), INP (interactivity) and CLS (visual stability).

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SSR vs SSG vs ISR

Three rendering strategies: server-rendered on each request (SSR), pre-rendered at build (SSG), or pre-rendered and revalidated (ISR).

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