Time to First Byte (TTFB) is a Core Web Vitals measurement used as to indicate a website’s responsiveness. It measures the amount of time between creating a connection to the server and downloading the contents of a web page. The metric is the sum of “Redirect Duration” + “Connection Duration” + “Backend Duration” and it a key indicators of web performance.

A website with a high TTFB can frustrate its visitors, and can lead to:

1. Your visitors may abandon your website and visit your competitor’s site
2. Your Search Engine Results Page (SERP) rank can suffer

What Is Considered A Good “Time To First Byte”?

According to Google, your website’s TTFB should be 200 milliseconds or less. If your site is much slower than that, such as 500 milliseconds or more, it needs some work.