When pages are optimized for Core Web Vitals, users have a better experience, and search engines reward them with higher rankings. Phil Walton says that Core Web Vitals isn’t a binary ranking factor though, and that relevance still plays an important role.

You can test your site’s performance using PageSpeed Insights on desktop and mobile. It will give you a report on lab and field data and label your pages with “Poor,” “Needs Improvement,” or “Good.”

Page Speed

Core Web Vitals are speed metrics that Google uses to measure page experience. These include Visual Load with Largest Contentful Paint (LCP), Visual Stability with Cumulative Layout Shift (CLS), and Interactivity with First Input Delay (FID). The data for these is based on field data from Chrome user experience reports (CrUX), which are collected from users who opt-in to share their information. Mobile pages that score well on all three of these metrics will pass the new Core Web Vitals ranking signal.

Getting a good score on each of these metrics is important, but it is also critical to understand how these work together as part of the overall website performance. There are a number of tools available that can help website owners get a better handle on how their pages perform across all of the Core Web Vitals. The most popular is Google PageSpeed Insights, which can provide both field and lab data on each of the metrics. It is important to remember that the Lab data on these tools is a best guess of what Google would like your page to look like, so it is a great starting point.

Once you have your site data, you can focus on improving the individual pages that are returning poor or need improvement scores. This is a great opportunity to improve UX on your site and generate more leads or sales from your website.

First Input Delay

First Input Delay, or FID, is one of the three Core Web Vitals metrics that became a ranking factor for Google search engine results in 2021. This real-user metric measures the number of milliseconds between when a user interacts with a website and when the site is ready to respond. This metric is an important measure of responsiveness and user experience.

Unlike CLS and LCP, which are lab metrics, FID is a field metric. This means that you cannot test it with a tool like PageSpeed Insights, but you can track it using tools such as Lighthouse. However, the results can sometimes be different between field and lab data. This is normal and is due to how the data is collected.

The most important thing to remember is that the FID score is a measurement of how long it takes for the browser to be ready to respond to a user’s input. That’s it! It doesn’t take into account things like scrolling or zooming, so it is a great indicator of how responsive a site is.

If a user can’t interact with a website quickly, they will leave and go to another competitor. This can have a negative impact on your business. That’s why it is important to optimize your website for FID so that you can provide the best user experience possible.

Loading Time

Loading time is impacted by a variety of factors, including the number and size of images, text, and other elements on the page. To improve loading times, web developers should remove elements that are not needed or reduce image sizes. In addition, they should use caching tools to store static HTML versions of pages, which can greatly reduce the loading time.

The Core Web Vitals initiative helps website owners optimize their websites by simplifying the complex landscape of performance metrics and highlighting those that matter most for SEO. In the past, many of these metrics were governed by technical factors that required extensive knowledge of how to tweak site code at a high level. These changes make it easier for non-technical users to understand how to improve their website’s performance and meet Google’s benchmarks.

Core Web Vitals include Largest Contentful Paint (LCP), First Input Delay (FID) and Cumulative Layout Shift (CLS). These three metrics are field-measurable and reflect a real-world experience, making them ideal for use as search ranking signals. Optimizing these metrics can significantly improve user experience, increase conversions, and generate more leads or sales for your business. As more businesses adopt these new metrics, their impact on search rankings is expected to grow. To prepare for the upcoming experience update, it is important to ensure that your website meets these critical goals by improving load speed, server response time and minimising layout shifts.


Google has a lot of power, and even minor changes in search engine algorithms can significantly affect the profitability and productivity of web-based businesses. This latest algorithm update has taken a user-centric approach that rewards websites that provide a great experience for their visitors, even though it may not increase rankings.

Core Web Vitals are based on real user metrics that Google collects from Chrome users and makes available to developers through tools like PageSpeed Insights and Search Console. In addition, Google provides lab data from its Lighthouse DevTools which can give you a more in-depth look at how Core Web Vitals are being measured.

The first measurement is called Time to First Byte (TTFB), and it measures the amount of time it takes for a browser to receive the first byte of a webpage from the server. A TTFB below a benchmark of 500 milliseconds is considered good.

The next metric is First Contentful Paint (FCP) which looks at how long it takes for the contents of a web page to be fully displayed on screen. FCP is considered good when it’s under 100 milliseconds on both mobile and desktop. Finally, the Visual Stability metric is called Cumulative Layout Shift (CLS), which looks at how many times the layout of a web page shifts unexpectedly during a visit. The more the layout shifts, the worse your CLS score will be. Google recommends a CLS score of 0.1 or less.

If you want to learn more about SEO web core vitals strategies to boost your SEO rankings, you can contact us today. At Let’s Run Local with our SEO Experience and your input from your business, we can create a really good SEO Strategy and attract the correct type of potential clients to your site.