Introduction to basic web metrics: Core Web Vitals

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Introduction to basic web metrics: Core Web Vitals

According to Google, an ideal website should load in less than 3 seconds. To achieve this, you must use best practices when it comes to your website’s speed and load time. So what does this entail? This article will introduce you to Core Web Vitals, also known as the ABCs of web metrics. An introduction to each metric will be followed by a step-by-step guide on how to improve them.

Page loading speed

Page loading speed is the measure of how fast a web page loads. The faster a page loads, the better the user experience. However, in the digital world, it is a more complex issue, because speed is made up of smaller values, e.g. loading a particular element.

This is important because it affects the user behaviors, and can also impact search engine ranking. In addition, slower load times are a big reason for abandoned shopping carts on e-commerce sites. So SEO services implement all countermeasures to improve the speed score and stabilize the website.

How does Google evaluate speed?

Google’s PageSpeed Insights tool evaluates the speed of a page on both mobile and desktop devices. The worth may range from 1 to 100. A 100 means that the website – in the opinion of Google – has followed the rules for optimization according to the most established standards. Additionally, the results of Core Web Vitals indicators, i.e. LCP, FID, CLS, are taken into account.

Core Web Vitals

Every website owner should have a basic understanding of web metrics. After all, how can you improve your website if you don’t know how people are using it? One of the most important metric groups is called Core Web Vitals. These are the key performance indicators that Google uses to measure user experience. There are three main factors in CWV: loading performance, interactivity, and visual stability. Each of the results can be checked in Google Search Console or Google Analytics.


Largest Contentful Paint measures how long it takes for the largest content element on your page to load. The goal is to have an LCP that occurs within 2.5 seconds of when the page first starts loading. On average, 50% of visitors will abandon a website if it takes more than 10 seconds to fully load. And studies show that nearly 75% of visitors expect a site to load in two seconds or less.

How to improve? 

To improve your LCP, you can optimize your images and minify your CSS and JavaScript files. You can also use a CDN to deliver your content faster. Another way is to optimize your website by using video compression techniques like encoding at an optimized bitrate. You can also make sure that the images on your site are compressed as well. If you’re using any plugins for WordPress or other platforms, be sure to disable them if they’re not in use.


First Input Delay is a web performance metric that measures the time from when a user first interacts with your page (i.e. clicks a link, taps on a button, etc.) to when the browser is able to respond to that interaction. A good FID should be less than 100 milliseconds. If the delay is too high, it could mean something went wrong in the loading process and your website may not be optimized for mobile devices.

How to improve?

The FID can be affected by both server-side and client-side delays, and may be reduced by optimizing any assets on the page that are causing too much work for the CPU or by minimizing network latency with techniques like caching and compression. Techniques like Progressive JPEGs will also reduce bandwidth usage and thus decrease the score. Optimizing images can also significantly reduce loading times – including images in CSS files as background images will not require a second HTTP request for them to render properly.


Cumulative Layout Shift measures how often users experience unexpected layout shifts on a page. A high CLS can negatively impact user experience, as it can make content difficult to read and use.

How to improve?

First, you should take advantage of browser caching whenever possible. Second, load external scripts at the bottom of the document instead of in the head or body tags. Finally, use CSS’s position property wisely when building layouts so that they’re more responsive and less prone to shifting unexpectedly. 

Speed optimization in the hands of SEO agency

If you have tried all the methods you know, and your result is still not satisfactory, this is probably the time to delegate this task to experts. The SEO Galway agency will perform an audit of your website speed, detect any problems and implement an appropriate recovery plan. To improve site performance, they can make changes to hosting configuration or change page loading scripts. They may also want to redesign a few pages on your site in order to create more white space and decrease load times. And finally, if necessary, they can identify technical bottlenecks that are slowing down your site’s performance by monitoring individual pages for common errors.

Wrapping up

You can’t improve what you can’t measure. To improve your website speed, you need to track your performance. Web metrics give you the data you need to do just that. And of all the web metrics out there, Core Web Vitals are some of the most important. In this post, we have covered these vital statistics and their significance for measuring and improving a site’s performance. With this knowledge in hand, it is time to get started!


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