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The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more.

First Meaningful Paint measures when the primary content of a page is visible. Learn more.

The last screenshot captured of the pageload.

Lists the network requests that were made during page load.

Used for treemap app

Lists the toplevel main thread tasks that executed during page load.

Collects all available metrics.

Server latencies can impact web performance. If the server latency of an origin is high, it's an indication the server is overloaded or has poor backend performance. Learn more.

Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance. Learn more.

Collection of useful page vitals.

Descriptive link text helps search engines understand your content. Learn more.

Interactive elements like buttons and links should be large enough (48x48px), and have enough space around them, to be easy enough to tap without overlapping onto other elements. Learn more.

All sites should be protected with HTTPS, even ones that don't handle sensitive data. This includes avoiding mixed content, where some resources are loaded over HTTP despite the initial request being served over HTTPS. HTTPS prevents intruders from tampering with or passively listening in on the communications between your app and your users, and is a prerequisite for HTTP/2 and many new web platform APIs. Learn more.

A strong Content Security Policy (CSP) significantly reduces the risk of cross-site scripting (XSS) attacks. Learn more

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more

All front-end JavaScript libraries detected on the page. Learn more.

The service worker is the technology that enables your app to use many Progressive Web App features, such as offline, add to homescreen, and push notifications. Learn more.

A maskable icon ensures that the image fills the entire shape without being letterboxed when installing the app on a device. Learn more.

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn more.

Low-contrast text is difficult or impossible for many users to read. Learn more.