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Measures the sum of all layout shifts that occur during the lifespan of the page session. It's important for visual stability of the website.

Measures how quickly the contents of a webpage are visibly populated. It's important as it's a general representation of how fast a user perceives the page to be loading.

Measures the process of rendering the necessary elements for a user to begin interacting with the page. It's important because it affects how quickly a user can see and use a web page.

Measures the time from the start of the page load to the point where it's capable of reliably responding to user input. It's important as it marks the point where a page becomes usable.

Measures the time to the point when the page's main thread is quiet enough to handle input. It's important as it signifies when a page is minimally interactive.

Measures the time from the start of the page load to when any part of the page's content is rendered. It's important as it provides users with the first visual feedback.

Measures the total amount of time between First Contentful Paint and Time to Interactive wherein the page was blocked from user input. Important as it impacts the user's ability to interact with the page.

Measures the time from the client making an HTTP request to receiving the first byte of the response. It's important as it affects user perception of website speed.

Measures the time from clicking a link to seeing the majority of the content on-screen. It's important for understanding the loading performance of the main content.