What are Core Web vitals?
In simple words, Core Web Vitals are related to the speed, visual stability, and responsiveness of a web page. It acts as the subset of web vitals that are already used and measured by various site owners. Core web vitals are basically metric used to quantify and improve the page experience for the user.
Earlier it was difficult for Google to discern the metric that tells how users interact with web pages. Different web vitals were used but it was difficult to recognize the exact measure. Until google started using core web vital metrics (LCP, FID, CLS) to perceive the first impression of a user while accessing a web page. These Core Web Vitals offer a holistic picture of how users interact with a web page.
So let’s dive in a see what is LCP, FID, and CLS and why you should consider it while optimizing your web page.
What is LCP?
Larget Contentful paint (LCP) is the metric that answers google how fast does the elements (text/image/video/GIFs) of your web page load and visible to users. Earlier there were few metrics like First Contentful Paint, First Meaningful Paint, SpeedIndex that were used to capture the loading speed of the initial paid but every matric had some limitations and complexation.
Compared to other loading experience metric LCP (Larget Contentful paint) is much more effective in offering quantified results. Google considers 2.5-second and fewer LCP measurements to be faster and 4.0 second and more to be slower (as shown in the picture). Google tools like Chrome user experience report, PageSpeed Insight and Search console can give you a clear picture of your web page LCP.
If we talk about how to improve your load speed? Then there are various components and elements through which you can reduce the LCP. Your server response time, javascript, CSS, and client-side rendering can help you to improve your load speed undoubtedly.
What is FID?
First Input Delay (FID) one of the important metrics that tell the time takes by a web page to become interactive. It determines the web page responsiveness and how fast a web page can paint pixels and respond to the user’s request (click on a button, link and more).
To offer optimized user experience your site should have First Input Delay (FID) of less than 100 seconds. FID is a core web vital metric that requires real users and can only be measured in the fields. First Input Delay of a web page can not be measured in the lab but total blocking time (TBT) correlates with FID and it can be quantified in the lab. Remember TBT reports large values.
Most of the time text content in the website becomes visible but other elements like images, videos and more take time to load that makes your web page partially interactive. To check your FID you can make use of tools like Chrome user experience report, PageSpeed Insight, Search console, and firebase performance monitoring.
What is CLS?
Cumulative Layout Shift (CLS) is a core web vital metric that quantifies the unpredicted layout shift occurring in a web page. These layout shifts (also known as content jank) cause movement in the content even after the page is fully loaded.
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