Core Web Vitals: How to Optimize Them for SEO

Core Web Vitals: How to Optimize Them for SEOPlay button
Video Duration
~18 mins

Understanding Google's Core Web Vitals: A Comprehensive Guide

Google's Core Web Vitals have become a crucial part of the search engine's page experience ranking signals. As a relatively new concept, there's a lot of misinformation and confusion surrounding this topic. This guide aims to demystify Core Web Vitals, explaining what they are, why they're important, and how to improve them for SEO. It delves into the three metrics that make up Core Web Vitals, their impact on page speed, and how they fit into Google's broader page experience signals. The guide also provides practical tips on optimizing these metrics and improving page speed.

Key Takeaways

  • Core Web Vitals are made up of three metrics: visual load, visual stability, and interactivity.
  • Improving Core Web Vitals can enhance page speed and conversions.
  • Field data and lab test data are the two main types of data for Core Web Vitals metrics.
  • Basic page speed optimizations can significantly improve Core Web Vitals.
  • Understanding how browsers render pages can help in optimizing the rendering process for images, CSS, and JS files.

Table of Contents

Understanding Core Web Vitals

Core Web Vitals are composed of three metrics that measure specific aspects of page speed. These metrics include visual load, measured by largest contentful paint, visual stability of web pages, measured by cumulative layout shift, and interactivity, which is done with first input delay. These metrics are part of Google's page experience ranking signals, which also include mobile friendliness, safe browsing, HTTPS, and intrusive interstitials.

Importance of Core Web Vitals

While the exact impact of Core Web Vitals is still unknown due to its novelty, it's worth improving these metrics as they can enhance page speed and conversions. Google found that when a site meets the optimal thresholds for the three Core Web Vitals metrics, users were 24% less likely to abandon page loads. This led to a decrease in site abandonment rates for news and shopping sites.

Types of Data for Core Web Vitals

Field data and lab test data are the two main types of data for Core Web Vitals metrics. Field data includes real user metrics and is generated from the Chrome user experience report. Lab test data, on the other hand, is generated by tools and is designed to run tests consistently under the same conditions. Both types of data are assessed at the 75th percentile of users and are measured by device type.

Optimizing Core Web Vitals

Before optimizing Core Web Vitals, it's important to handle the basics of Google's page experience signals like mobile friendliness and HTTPS. Basic page speed optimizations like good hosting, caching content, compressing and lazy loading images, and setting up a CDN can also help improve Core Web Vitals. For more technical optimizations, understanding how browsers render pages can be beneficial.

Improving Page Speed

Improving page speed involves optimizing the rendering process for images, CSS, and JS files. For images, preloading can significantly reduce page load times. For CSS files, minification, inlining critical CSS, and removing unused CSS can enhance load times. For JavaScript, deferring or asynchronously loading JS can improve page speed.

Rendering Process Optimization

Optimizing the rendering process involves understanding how browsers process files. When a user enters a URL in their browser, the browser sends a get request to get the contents of the requested URL. The browser then parses the contents and loads the resources. Optimizing this process can significantly improve page load times and Core Web Vitals.


While Core Web Vitals are a relatively new concept, they play a crucial role in Google's page experience ranking signals. Improving these metrics can enhance page speed, improve conversions, and potentially boost SEO rankings. However, quality content still comes first, and Core Web Vitals may serve more as a tiebreaker than a make-or-break ranking signal. Regardless, understanding and optimizing these metrics can lead to a better user experience and potentially higher conversions.

Is this you?

💸 You have been spending thousands of dollars on buying backlinks in the last months. Your rankings are only growing slowly.

❌You have been writing more and more blog posts, but traffic is not really growing.

😱You are stuck. Something is wrong with your website, but you don`t know what.

Let the SEO Copilot give you the clicks you deserve.