Viewing Key Performance Metrics in Chrome

Frontend developers need to pay attention to key performance metrics that help us understand website performance status and optimize accordingly.

Google provides a tool that allows you to view website performance metrics and optimize them: https://pagespeed.web.dev/

In addition to using the web interface, you can also view these metrics directly in the Chrome browser.

TTFB (Time to First Byte)

“Waiting for server response” represents the TTFB metric. In the Network tab, find the main HTML request, and in the Timing section, “Waiting for server response” represents the TTFB metric.

FCP (First Contentful Paint)

First Contentful Paint measures when the first text or image content is rendered on the screen.

LCP (Largest Contentful Paint)

Largest Contentful Paint measures when the largest content element becomes visible in the viewport.

INP (Interaction to Next Paint)

Measures how quickly a web page responds to user interactions - an important responsiveness metric.

CLS (Cumulative Layout Shift)

Cumulative Layout Shift measures visual stability by quantifying how much visible content shifts during page load.

Final Thoughts

Understanding these key performance metrics is essential for frontend developers to optimize website performance and provide better user experiences. Chrome’s built-in developer tools make it easy to monitor these metrics during development and testing.