Web Page Optimization Is Key for Google Algorithms
Google’s Web Vitals initiative provides guidance about web page performance quality signals that are essential for all sites to attain in order to deliver a superior user experience on the web and provide better SEO page search rankings. Core Web Vitals are a subset of performance metrics that apply to all web pages that should be measured by all site owners, with support across all Google tools. It will be part of Google’s “page experience” score to establish a ranking factor. These metrics include loading performance (how fast does web page content appear on the screen?), responsiveness (how fast does the page react to user input?), and visual stability (does content move around on the screen while loading the page?).
Google has defined three Core Web Vitals metrics to specifically quantify these page experiences:
Largest Contentful Paint (LCP)
Largest Contentful Paint (LCP) measures how long it takes for the largest piece of content (like an image or block of text) to appear on the screen. A good score indicates that your site loads quickly for the user., and it accounts for around 25% of the Page Insight score. A slow site can lead to frustration for users. An ideal LCP measurement is 2.5 seconds or faster, providing a good user experience and optimal SEO performance. First Contentful Paint (FCP) is related to LCP but is a non-Core Web Vital scoring metric that measures the time from when a page starts loading to when any part of that page's content is rendered on the screen. FCP is a user-centric metric for measuring page load time and speed. Google has specific LCP guidelines. They break LCP speed down into three buckets: Good, Needs Improvement, and Poor.
First Input Delay (FID)
First Input Delay (FID) measures the length of time it takes for the site to respond to an initial user action (such as a button click) An ideal measurement is less than 100 ms, which reflects in a very usable web page and positive user experience. Time to Interactive (TTI) is a related non-core web vitals metric that measures the time from when the page starts loading to when it is capable of reliably responding to user inputs.
Cumulative Layout Shift (CLS)
Cumulative Layout Shift (CLS) measures the amount of unexpected layout shift of visual page content. For example, does content regularly move around on the screen while it is still loading?An ideal measurement is less than 0.1 as this reflects a stable page with good experience for the user.