Cumulative Layout Shift measures the movement of visible elements within the viewport. [Learn more](https://web.dev/cls/).

Cumulative Layout Shift

Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy. [Learn more](https://web.dev/estimated-input-latency/).

Estimated Input Latency

First Contentful Paint marks the time at which the first text or image is painted. [Learn more](https://web.dev/first-contentful-paint/).

First Contentful Paint

First Meaningful Paint measures when the primary content of a page is visible. [Learn more](https://web.dev/first-meaningful-paint/).

First Meaningful Paint

Time to interactive is the amount of time it takes for the page to become fully interactive. [Learn more](https://web.dev/interactive/).

Time to Interactive

Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn More](https://web.dev/lighthouse-largest-contentful-paint/)

Largest Contentful Paint

Keep the server response time for the main document short because all other requests depend on it. [Learn more](https://web.dev/time-to-first-byte/).

Reduce initial server response time

Speed Index shows how quickly the contents of a page are visibly populated. [Learn more](https://web.dev/speed-index/).

Speed Index

Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. [Learn more](https://web.dev/lighthouse-total-blocking-time/).

Website performance of http://opticienconseil.fr