Frontend & browser·Performance and Core Web Vitals
the big hero image finally rendered, four seconds after the header was already on screen.
Largest contentful paint
Also calledLCP
The render time of the largest text block or image in the viewport, taken as a proxy for when the page's main content is visible. It answers 'can I see what I came for', which is why it is a headline metric and first contentful paint is not. The element it picks is often not the one you assumed, so the first step is always to look at which element the tooling identified.