First Contentful Paint

The moment the browser paints the first piece of content — text, image or canvas — on screen.

Improve it by cutting render-blocking resources and shortening server response, in that order.

Read it at the 75th percentile of real users, not in a lab run on a fast laptop.

It is the first point at which a visitor knows the page is working at all.

A slow first paint pushes bounce rate up before a single word has been read.