The 'First Contentful Paint' metric indicates when the first text or image is displayed.
The 'Largest Contentful Paint' metric indicates when the largest text or image element is displayed.
Sum in milliseconds of all periods between FCP and Time to Interactive, when task length exceeded 50ms.
Cumulative Layout Shift measures the movement of visible elements within the viewport.
The 'Speed Index' metric shows how quickly the contents of a page are visibly populated.