Understanding the performance of a web page
Web Vitals is an initiative promoted by Google to standardize the measurement of the user experience and performance of a website. One aim of the initiative is to determine the most important of these performance measures, which they call the Core Web Vitals.
The metrics defined and used to measure web performance evolve over time but, since 2020, the three main metrics used are as follows:
- Largest Contentful Paint (LCP)
- First Input Delay (FID)
- Cumulative Layout Shift (CLS)
Each metric measures a different aspect of user experience as it is impacted by performance.
By following best practices and getting these aspects of a web page right, you will not only improve the performance a user will experience but also the chance of your web page being rated highly by Google, and therefore improving SEO.
Let’s look at the metrics in detail.
Largest Contentful Paint (LCP)
LCP measures the loading performance...
