What Core Web Vitals actually mean for your business
Google's Core Web Vitals are not just a technical metric. A poor LCP or CLS directly affects your search ranking and your user experience. Here's what to know.
Your developer mentions "Core Web Vitals" and you nod. But what are they actually measuring, and why should you, as a business owner rather than a developer, care about the scores? Here is a plain-language explanation of what Core Web Vitals are, what each one means for your users, and what poor scores cost you in practice.
What Core Web Vitals are
Core Web Vitals are a set of three measurements that Google uses to assess the real-world experience of loading and using a webpage. They are not abstract technical benchmarks. They are direct proxies for what your users experience when they land on your site.
Google uses these scores as a ranking signal. A site with poor Core Web Vitals scores lower in search results than an equivalent site with good scores, all else being equal. That means a bad score does not just hurt your users. It reduces how many of them ever find you.
The three metrics, explained without jargon
LCP - Largest Contentful Paint. This measures how long it takes for the main content of a page to become visible. Think of it as: how long does a visitor wait before they see something meaningful? A good LCP is under 2.5 seconds. A bad LCP is over 4 seconds. If your LCP is 5 seconds on mobile, half your visitors are already gone before they see your product.
INP - Interaction to Next Paint. This measures how quickly your site responds when a user does something: clicks a button, taps a link, opens a menu. A good INP is under 200 milliseconds. A bad INP means your site feels sluggish and unresponsive. On an e-commerce site, a slow INP on the "Add to Cart" button costs conversions directly.
CLS - Cumulative Layout Shift. This measures how much the page jumps around while loading. You have experienced bad CLS when you are about to tap a button and the page shifts, and you tap something else by accident. A good CLS is below 0.1. Bad CLS destroys trust immediately. A page that moves around does not feel stable or professional.
Why Google uses them as a ranking factor
Google's goal is to show users the most useful and best-experienced results for any given search. A site that ranks well but delivers a slow, unstable experience is a bad recommendation. Core Web Vitals are Google's way of measuring whether a site deserves its ranking based on actual user experience, not just content relevance.
This is not going away. Google has made clear that page experience signals (Core Web Vitals are the core of these) will continue to be part of ranking for the foreseeable future.
What a bad score costs you
A poor LCP means users leave before seeing your content. A poor INP means users find your site frustrating to use. A poor CLS means your site feels unreliable.
Combined: you rank lower, fewer people find you, and the ones who do have a worse experience. That affects every downstream metric: traffic, time on site, conversion, and revenue. The impact is measurable and consistent.
For more on how performance connects to conversion, how performance affects conversions is the place to start.
What a good score looks like, and how to get there
Good Core Web Vitals scores (LCP under 2.5s, INP under 200ms, CLS under 0.1) are achievable but not automatic. They require architectural decisions made early: how images are loaded, whether the site uses static generation, how JavaScript is split and deferred, how fonts are loaded.
Custom-built sites using modern frameworks like Next.js can achieve scores above 90 on mobile because the architecture is chosen to produce performance, not constrained by a platform that was not designed for it. Custom sites can reach 90+ on mobile when performance is treated as an architectural requirement, not an afterthought.
WordPress and template-based sites can achieve acceptable scores, but they require significant additional effort: fighting the platform's default behavior rather than working with a system designed for performance.
Where to check your site's scores
Go to PageSpeed Insights (search for it) and enter your URL. You will get your LCP, INP, and CLS scores for both mobile and desktop, along with specific suggestions for what to improve. If your mobile score is below 70, that is the number to fix first. mobile is where most of your Moroccan users are.
If you want us to look at your score and tell you honestly what it means and what it would take to improve it, the contact form is below.