Core Web Vitals

What Are Core Web Vitals: What You Need To Know

in Technology on August 24, 2022

When it comes to website design and development, there’s of course a whole heap of things that you need to think about that isn’t just about the aesthetics. There’s user experience, navigation and so much more. Then there’s how a website performs. This can not only affect how people interact with your website but also how it performs on search engines. Website designers or website builder company templates will bear in mind how a website performs, however, there are still widgets and features of a site that can really slow a page down, which will ultimately impact how a page ranks on the likes of Google. One of the key ranking factors when it comes to Google, is Core Web Vitals, a set of metrics that are instrumental in a website being a success. But what are they and how do they work?

What are Core Web Vitals?

Core Web Vitals are a specific set of factors that Google considers of high value in a particular website’s overall user experience.

Google’s Core Web Vitals are broken down into three different measurements, these being:

  • Largest Contentful Paint
  • First Input Delay
  • Cumulative Layout Shift

So, what are these?

Largest Contentful Paint (LCP)

Largest Contentful Paint, also known as LCP, is a measurement of how long a page takes to load from the perspective of the user. This is hugely important as ultimately if a page takes a long time to load, then they’re going to close the page and go elsewhere.

Largest Contentful Paint measures the speed for the main elements of the page to load, with a good measurable for this being around the 2-second mark, whereas anything over that would be considered poor or requiring improvement.

First Input Delay (FID)

First Input Delay is the second part of Core Web Vitals and it measures how users interact with your page and how long that takes for them to do that. The first input delay measures a number of different types of interactions, including:

  • Making a choice from a menu
  • Clicking a link
  • Filling out a box
  • Opening up an accordion

Google scores any first input delay of around 100 MS or faster as good; with anything between that number and slower either requiring improvement or being poor.

Cumulative Layout Shift (CLS)

Finally, Cumulative Layout Shift is a measurement of how stable a page is. For a user, there’s nothing worse than a page loading and then jumping around as you try to interact with it. CLS is essentially a measurement of this and how long it takes for a page to be visually stable.

When it comes to Cumulative Layout Shift, a good score would be considered for those pages that load and are stable within 0.1 seconds after the page has loaded, while between 0.25 and slower would be considered poor.

Ensuring that your website falls into the “good” bracket of Google’s Core Web Vitals; particularly for a newly designed site is vital. After all, otherwise, you will have invested in a new website, only for nobody to see it!




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