Performance Budgets

Table of contents

Web Vitals

Adding content extraction to your website audit

Time To First Byte (TTFB)

The time it takes to receive data from the server.

Cumulative Layout Shift (CLS)

A measurement of movement in visual elements as they are rendered.


Largest Contentful Paint (LCP)

The time at which the largest image or text block becomes visible.

First Contentful Paint (FCP)

The time at which the first text or image becomes visible.

Time To Interactive (TTI)

The time it takes for the page to become fully interactive.

Total Blocking Time (TBT)

The total time the page was blocked, preventing input responsiveness.