What are Core Web Vitals?

Website performance is the measure of how quickly a website responds to user requests. It is determined by a variety of factors, including the website’s hosting environment, the size and complexity of the website’s code, and the number of users accessing the website at the same time. Website performance is especially important for e-commerce websites, as slow loading times can lead to lost sales.

Using Google’s Pagespeed Insights tool, you can establish an idea of what issues are affecting your website’s performance. Pagespeed Insights is a tool that can help you improve the performance of your website. It analyzes your website and provides feedback on how you can improve its performance.

The results of a Pagespeed Insights report will evaluate the performance, and classify the response into Good (results are displayed in green), Needs Improvement (results are displayed in orange), and Poor (results are displayed in red). The measurements performed in the test are called Core Web Vitals.

What are Core Web Vitals

Core Web Vitals is an initiative by Google to provide guidance for delivering a great user experience on the web. The Core Web Vital represent different areas that affect the user experience. These areas are measurable, and are a reflection of the website visitor experience.

Source: Google

First Contentful Paint

First Contentful Paint (FCP) is a metric that measures how quickly a user sees some content on a web page. This metric is important because it can help you determine how quickly you can start engaging users on your page.

FCP is determined by measuring the time it takes for a page to load its first meaningful piece of content. This could be an image, headline, or other piece of text.

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Time To Interactive

Time to Interactive (TTI) is a metric that measures the amount of time it takes for a user to start interacting with a website, such as clicking on links or buttons on a website. This metric is important because it can help to determine how user-friendly a website is.

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Speed Index

The Speed Index is a metric that is used to measure how quickly a web page is able to load. It is calculated by measuring how much of the page is visible to the user at any given time. This metric is important because it can help to identify how quickly a web page is able to load and whether or not it is meeting the user’s expectations.

The Speed Index is calculated by taking the total time it takes for the page to load and dividing it by the total visible area of the page.

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Total Blocking Time (TBT)

Total Blocking Time is the amount of time that a browser spends waiting for a response from the server. This time is measured in milliseconds, and is shown as a percentage of the page’s load time. If the Total Blocking Time is high, the page is likely to load slowly. You can improve the Total Blocking Time by optimizing your images, scripts, and CSS.

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Largest Contentful Paint (LCP)

Largest Contentful Paint, or LCP, describes the point in time at which the majority of the content on the screen is visible. This can be helpful in determining when to initiate loading of additional resources, as waiting until Largest Contentful Paint has been reached can minimize the chance of the user seeing a blank screen.

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Cumulative Layout Shift (CLS)

Cumulative Layout Shift (CLS) is an important, user-centric metric for measuring visual stability because it helps quantify how often users experience unexpected changes in the visual presentation of your website, such as inconsistent font sizes, changes in column width, and unexpected whitespace. All of these can combine to create a jarring and disruptive user experience.

Read more information on Cumulative Layout Shift

Next Steps

Read Actionable steps to improve website performance

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Joff Crabtree

Joff Crabtree

Joff is a digital innovation specialist guiding data-driven decision making to transform business potential.

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