Core Web Vitals

What are core web vitals and why they are important

What are core web vitals and why they are important


When you’re building a website, there are a few core pieces of information you need to know in order to make sure it’s running optimally.

In this guide, we’ll walk you through each of the core web vitals, and explain what they are and why they’re important.

By the end of this article, you’ll have a solid understanding of what your website needs to function at its best. Let’s get started!

What Are Core Web Vitals?

Core Web vitals are a set of standardized metrics that Google considers important and consider the overall user experience.

These metrics use by all site owners to break down the user’s experience.

Core Web Vital uses three primary areas for user experience

  • Page Speed
  • Ease of Interaction
  • Visual visibility of a page

Why Core Web Vital is important

Google considers this important for user experience which includes

  • Mobile Friendliness
  • Safe Browsing
  • Lack of pop-ups

Google did not rank you as #1 even if your page has a great experience. Page experience is one of the several factors that Google uses to rank a site in a search result.

Google said that we have to wait till next year to improve the Core Web Vital score in our website.

Below are the three main factors of Core Web Vitals

Largest Continential Paint (LCP)

Largest Contentful Paint is a Core Web Vitals metric that site owners see if a page is useful to base on the largest blocks visible to an audience and also use to assess user experience.

Every site owners want to load their website pages fast for an enjoyable user experience. Load time is a critical factor for a positive user experience. Google rank higher those pages that load quickly.

How LCP Measure

LCP measures the time of different content blocks. This metric tells you how content is visible on screen quickly. Below are the points to consider for a quick load of web pages.

  • Images
  • Video poster images
  • Background images
  • Block-level text

Cumulative Layout Shift (CLS)

Cumulative Layout Shift is a metric that identifies buttons or links in a web page. Site owners engage buttons and links on a website to drive sales and conversions. It reflects the level of difficulty that user experience when trying to engage on your website.

UX and configuration are crucial parts of a decent client experience, and a client will become disappointed on the off chance that a site page shifts components while a client is perusing.

CLS assists engineers with deciding whether pictures or connections shift on the page so webpage proprietors can further develop ease of use,
drive navigate rates, and work on web-based deals.

How CLS measure?

CLS measures to check that elements shift from their starting position in the visible viewport between two rendered frames. This metric helps to site owners if buttons, banners, and text is pushed around while the user is reading content on a web page.

Users will be confused and cause a bad experience on a web page if elements can change position. After the page loads on the user’s device, it’s essential to ensure that all content stays in place. CLS looks at these metrics to ensure the visual stability of a page from a user perspective by considering the below factors. CLS of 0.1 or less is perfect for site owners

  • Layout shift
  • Impact fraction
  • Distance fraction

First Input Delay (FID)

Users want pages that are fast to load and easy to access. First Input Delay measures input latency to identify pages that cause bad experiences for users.

Nowadays websites use an array of dynamic content widgets and advanced technologies to provide content to their audience. This type of content can improve delivery content, but this measurement can delay times that require a user to wait for the page to load.

Developers should reduce the time that users wait for a browser to answer their queries and improve usability and engagement across the site.

How FID Measure

When the user input any query in the website then FID measures how responsive a page is. FID only records events like key presses and like clicks.

The good user experience of FID is below 100 milliseconds. This tool is difficult to measure because it can only be measured in the field.

The score will depend on variables that are outside of your control, such as Internet speeds and device capability experienced by your audience.


The introduction of Core Web Vital was a big step towards making the web page easy to access, interactive, and better for users. It is also part of Google’s ranking algorithm. Through this metric users also better their website rank in search engines.

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