Performance and Core Web Vitals
Lighthouse page speed and Core Web Vitals, mobile and desktop.
What it tells you
Part of site health. These checks read how fast each page loads and settles, measured by Google Lighthouse on mobile and desktop.
How it is measured
- Largest Contentful Paint (LCP): how long the main content of the page takes to appear.
- Cumulative Layout Shift (CLS): how much the page jumps around while it loads.
- Total Blocking Time (TBT): how long the page is too busy running scripts to respond to a tap or a click.
Checks
Page size under 1MB
The page is over 1 MB, which slows loading on poor connections.
Read the documentation ›Page size under 3MB
The page is over 3 MB. Heavy enough to hurt experience measurably on mobile networks.
Read the documentation ›Page not too small
The page is unusually small, which sometimes means content failed to render rather than that the page is efficient.
Read the documentation ›No render-blocking resources
Scripts or stylesheets delay first paint. It slows the page down without preventing anything from being read.
Read the documentation ›Performance score
The Lighthouse performance score for this page is below 90. This is a summary, the individual performance audits are listed as their own findings.
Read the documentation ›Lighthouse metrics collected
Lighthouse did not return a report for this page, so its audits are missing from this run.
Read the documentation ›Seen in the app on: Technical Audit
See how the brand's site does on these checks.Related guides
- How the audit score is built
One score out of 100 for the brand's site: how well AI models can reach and read it, and how sound it is, with AI readability counting most.
- AI readability and site health
AI readability is whether AI models can reach and understand the brand's pages; site health is how fast, safe and sound they are.
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