Google Lighthouse 13 Rolls Out With Insight-Based Audits

Google Lighthouse 13 rolls out with insight-based audits, offering developers deeper analysis to enhance website performance and SEO efficiency.

Google has released Lighthouse 13, introducing a major update that replaces many legacy audits with new, insight-driven audits aligned with Chrome DevTools. The update streamlines auditing, removes outdated checks, and maintains the way performance scores are calculated.

The update is currently accessible through npm and Chrome Canary. It’s expected to integrate into PageSpeed Insights within a week and reach Chrome’s stable channel with version 143.

Audit Consolidation with Clearer, Actionable Insights

Lighthouse 13 swaps numerous old audits for insights that mirror the approach used in Chrome DevTools, making reporting more consistent across Google’s tools.

Key audit replacements include:

• CLS and Layout: The layout-shifts audit is now cls-culprits-insight, improving identification of layout shift causes.
• Server and Network: Redirects, server response, and text compression audits combine into document-latency-insight.
• Images: Traditional image audits are replaced by image-delivery-insight, covering formats, optimization, responsiveness, and animation.
• Largest Contentful Paint (LCP): Broken into lcp-discovery-insight and lcp-phases-insight, with interaction metrics handled by interaction-to-next-paint-insight (INP).
• Third-Party Scripts: The older third-party summary is replaced by third-parties-insight, showing external script impact more clearly.

Additional audits consolidated or renamed address DOM size, JavaScript duplication, font display, legacy scripts, HTTP/2, caching, and more.

Removal of Obsolete and Costly Audits

Several audits have been completely removed due to their age, low value, or high resource demands. Notable removals include:

• first-meaningful-paint
• font-size
• offscreen-images
• preload-fonts
• uses-rel-preload
• no-document-write
• uses-passive-event-listeners
• third-party-facades

Despite the removal of font-size and preload-fonts, other diagnostics like non-composited-animations and unsized-images remain separate for targeted issue detection.

Performance Scoring Remains Stable

Importantly, Lighthouse confirms that the performance score calculation remains unchanged, as it continues to use the core performance metrics rather than audit names or groupings.

This means updating to Lighthouse 13 will not affect your performance grades, just how audits are presented and grouped.

Looking Ahead

Google plans to sustain alignment between Lighthouse and Chrome DevTools, enhancing consistency for users.

Developers and marketers should prepare for these changes by mapping old audit IDs to new insights ahead of rolling out Lighthouse 13 in Chrome Stable version 143 and PageSpeed Insights updates.

Bottom Line

Lighthouse 13 is a thoughtful evolution, streamlining web performance auditing while offering clearer, more focused insights. It is a must-know for modern web teams aiming to optimize user experience and SEO simultaneously.