Web Performance Overlay is a free Chrome extension designed to display Core Web Vitals, which include Largest Contentful Paint (LCP), First Contentful Paint (FCP), Cumulative Layout Shift (CLS), and Time to First Byte (TTFB), directly on any webpage. This tool allows users to capture a performance snapshot at any given moment, making it easy to monitor changes in website performance over time.

Ideal for developers, testers, and performance engineers, the extension facilitates the comparison of website metrics by revisiting pages at different times. For instance, users can assess how performance metrics for platforms like YouTube evolve throughout the day. With its lightweight design and user-friendly overlay, Web Performance Overlay is an essential tool for anyone looking to enhance their understanding of website speed and user experience.