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These checks ensure that your page is optimized for users to be able to see and interact with page content.
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged.
These checks highlight opportunities to improve the overall code health of your web app.
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more.
These checks validate the aspects of a Progressive Web App. Learn more.
First Contentful Paint
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Largest Contentful Paint
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Cumulative Layout Shift
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
JavaScript execution time
Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn more.
Efficiently encode images
Optimized images load faster and consume less cellular data. Learn more.
Avoids an excessive DOM size
A large DOM will increase memory usage, cause longer style calculations, and produce costly layout reflows. Learn more.
Avoids front-end JavaScript libraries with known security vulnerabilities
Some third-party scripts may contain known security vulnerabilities that are easily identified and exploited by attackers. Learn more.
Uses HTTP/2 for its own resources
HTTP/2 offers many benefits over HTTP/1.1, including binary headers, multiplexing, and server push. Learn more.
Redirects HTTP traffic to HTTPS
If you’ve already set up HTTPS, make sure that you redirect all HTTP traffic to HTTPS in order to enable secure web features for all your users. Learn more.
Time To Interactive
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.