Core Web Vitals for E-commerce: What They Are and How They Impact Your Sales in 2025

Core Web Vitals measure the loading, interactivity, and visual stability experience of any website, and Google has directly used them as a ranking factor since 2021.

There are three specific metrics: LCP (how quickly the main content appears), INP (how quickly the store responds to user clicks), and CLS (if page elements move unexpectedly while the user tries to click). A store that doesn't meet the minimum thresholds for these three metrics loses positions in Google compared to slower competitors.

In this article, you'll learn exactly what each metric measures, how to diagnose your store's current status with free tools, what the minimum thresholds Google requires are, and what the most frequent errors in Colombian stores are that slow down LCP without the owner knowing it.

What are Core Web Vitals and why does Google use them to rank stores?

Core Web Vitals are a set of metrics designed by Google to quantify the actual user experience when browsing a web page. They are not technical metrics for developers; they are direct indicators of how your customer perceives the speed, responsiveness, and visual stability of your online store. Google adopted them as a crucial ranking factor because, for them, a good user experience is synonymous with a quality website, and that's what they want to reward in their search results.

For an e-commerce owner, this means that the speed and fluidity of their store are not just a technical whim, but a fundamental element that directly impacts their visibility in search engines and, therefore, their sales. A slow store frustrates the user, leads them to abandon the purchase, and also tells Google that your site doesn't offer the best possible experience, which translates into a lower ranking and less organic traffic.

Ignoring Core Web Vitals is like having a physical store with a sticky door or a wobbly counter: customers will leave before seeing what you offer. Google is simply replicating this principle in the digital world, using these metrics to ensure users find the best websites.

LCP: How quickly your store's main content appears

LCP (Largest Contentful Paint) measures how long it takes for the largest visible content element on the user's screen to load. In an online store, this element is usually the main product image, a large promotional banner, or the first section of important content. If your LCP is high, it means your customers are waiting too long to see the most relevant part of your page, which leads to impatience and often abandonment.

A slow LCP is a silent killer of your sales. Today's users expect immediacy; if your star product image takes too long to appear, they're likely to close the tab before even considering it. Google recommends that LCP occur in less than 2.5 seconds for most users.

INP: How quickly your store responds when the user clicks

INP (Interaction to Next Paint) measures interaction latency, which is the time from when a user interacts with your store (clicks a button, selects an option in a dropdown menu) until the browser displays the visual response to that interaction. Poor INP means your store feels slow and unresponsive, even if the page has already loaded visually.

Imagine a customer trying to add a product to the cart or apply a filter, and the page takes time to react. That small but noticeable delay is frustrating and breaks the purchase flow. A high INP creates the feeling that the store is "frozen" or "working," which is fatal for conversion. Google sets a threshold of 200 milliseconds for a good INP.

CLS: Why your store's buttons move unexpectedly and the user clicks on the wrong thing

CLS (Cumulative Layout Shift) measures the visual stability of a page. It refers to unexpected movements of elements on the screen while the page loads. Have you ever tried to click a button, and just before you touch it, an ad or image loads and pushes everything else, making you click on something else? That's a high CLS.

In an online store, poor CLS can lead to erroneous clicks, frustration, and a chaotic user experience. A customer trying to add a product to the cart and ending up clicking on an advertising banner due to a sudden layout shift is a lost customer. Google considers a good CLS to be less than 0.1.

Does Google really lower rankings due to store speed?

Yes, Google really does lower a store's ranking due to its speed, and it does so explicitly. Since the Page Experience update in 2021, Core Web Vitals have become a direct ranking factor for search results. This means that if your store has poor metrics, Google will consider it lower quality in terms of user experience and, therefore, will rank it below competitors that offer a better experience, even if your content is equal or superior.

The impact is not necessarily a "penalty" in the traditional sense, but rather a "deprioritization." Google prefers to show sites that offer a smooth and fast experience. If your store doesn't meet those standards, your competitors with healthy Core Web Vitals metrics will gain visibility and organic traffic that would otherwise be yours. It's a clear and measurable competitive disadvantage.

Beyond SEO, speed directly impacts the conversion rate. Studies by Google and other sources show that a delay of just one second in load time can reduce conversions by up to 7%. Therefore, even if you don't see a direct "penalty" in your console, the loss of ranking and sales is an undeniable consequence of a slow store.

How to know today if your store has Core Web Vitals issues

Identifying if your online store has problems with Core Web Vitals is the first step to solving them. Fortunately, Google offers free and accessible tools for any business owner, without the need for advanced technical knowledge. These tools will give you a clear and actionable diagnosis of your site's performance.

You don't need to be a developer to use these tools; they are designed to give you valuable information about your customers' experience. Understanding these reports will allow you to make informed decisions or, at least, know what to ask your development team.

How to use PageSpeed Insights step-by-step

PageSpeed Insights is the most direct tool for evaluating the Core Web Vitals of a specific page. It's free and extremely useful. Simply go to pagespeed.web.dev, enter the URL of one of your pages (start with the homepage or a key product page), and click "Analyze."

The tool will show you two main scores: one for mobile and one for desktop, along with the LCP, INP, and CLS values. Look for the "Passed" or "Failed" labels below each metric. If you see "Failed" for any of the mobile metrics (which is the most important environment for Google), your store has a problem that needs urgent attention. The tool will also provide detailed suggestions on what to optimize, identifying the specific elements causing the problems.

How to read the Page Experience report in Google Search Console

Google Search Console is your best friend for understanding how Google sees your site. Within Search Console, find the "Experience" section and then click on "Core Web Vitals." Here you'll see a consolidated report of all your site's pages, classified as "Good URLs," "Needs improvement," and "Poor URLs."

This report is crucial because it shows you Google's view of your users' actual experience (field data) over a 28-day period. It allows you to identify patterns, such as whether all your product pages are failing or only certain sections. At Ferova Agency, when we audit online stores, the first thing we check is the Core Web Vitals report in Google Search Console, because it's the quickest indicator of speed problems that Google is already penalizing—and that the store owner generally hasn't seen before. This report will tell you exactly how many pages are at risk and for which metric.

What minimum scores your store needs to avoid losing rankings

To avoid losing positions in Google and ensure a good experience for your users, your store must meet the following thresholds for Core Web Vitals, on both mobile and desktop devices:

• LCP (Largest Contentful Paint): Must be less than 2.5 seconds. This means that the main content of your page must load very quickly.
• INP (Interaction to Next Paint): Must be less than 200 milliseconds. Your store must respond almost instantly to user interactions.
• CLS (Cumulative Layout Shift): Must be less than 0.1. Your page elements must remain stable while loading, without unexpected movements.

These are the minimum thresholds that Google considers "good." If your store has values above these, Google will classify it as "Needs improvement" or "Poor," which will negatively impact your ranking. It's important to aim for these values and maintain them, as the competition for top positions is fierce and every millisecond counts.

The most frequent errors in Colombian stores that slow down LCP

While a store may seem to load quickly from your computer with an excellent internet connection, the reality for many of your customers, especially on mobile and with slower connections, is different. There are common errors that affect the LCP of stores, and that often go unnoticed:

• Unoptimized images: This is the number one culprit. Uploading product images directly from the camera or without compression can make them weigh several megabytes. Each of these large images drastically slows down LCP, especially on category pages with many images or on product pages with galleries.
• Excessive use of JavaScript and unoptimized CSS: Many e-commerce themes, plugins, or applications add JavaScript and CSS code for functionalities or visual styles. If this code is not well optimized, if it loads excessively, or blocks rendering, it directly affects the time it takes for the browser to display the main content.
• Slow or poorly configured hosting servers: An inexpensive hosting can be tempting, but if the server is slow or not configured to handle your store's traffic, the site's initial response will be delayed, impacting LCP. The geographical location of the server also influences latency for your customers.
• Unoptimized custom web fonts: Using Google Fonts or custom fonts can improve your store's aesthetics, but if they don't load efficiently, they can block text rendering, delaying LCP.
• Too many plugins or apps: Every plugin or app you install on your platform (Shopify, WooCommerce, etc.) adds code and resources that must be loaded. An excess of unnecessary or poorly optimized plugins is a common cause of general slowness and a high LCP.

Identifying and correcting these errors is fundamental to improving LCP and, consequently, your users' experience and your Google ranking.

Conclusion and next steps

Core Web Vitals are not just technical metrics; they are a direct reflection of the shopping experience you offer your customers and an undeniable factor for your store's success on Google. Ignoring them means ceding ground to the competition and frustrating potential buyers. Understanding and improving these indicators is a direct investment in the profitability and growth of your digital business.

To start improving your store's speed today:

• Use PageSpeed Insights to analyze your homepage and some key product pages.
• Review the Core Web Vitals report in your Google Search Console to get an overview of your entire site.
• Prioritize image optimization: compress them and use modern formats like WebP.
• Consult with your developer or hosting provider about possible server improvements.

In today's digital landscape, where user patience is limited and competition is high, a store that doesn't prioritize speed and user experience is doomed to lose sales and visibility. Core Web Vitals are Google's way of telling you "Your store is slow, and that affects your customers." Stores that ignore these signals in the next 12 months will simply see their competitors surpass them in search results and capture more market share.

At Ferova Agency, we analyze your store's Core Web Vitals at no cost. Schedule your diagnosis.

Frequently Asked Questions (FAQ)

What minimum PageSpeed score does an e-commerce need?

For Core Web Vitals, Google considers "good" an LCP below 2.5 seconds, an INP below 200 milliseconds, and a CLS below 0.1. Although PageSpeed Insights shows an overall score from 0 to 100, the most important thing is that the three individual metrics are in green, as these are what directly impact ranking.

Do Core Web Vitals affect mobile and desktop equally?

Yes, Core Web Vitals affect both mobile and desktop. However, Google prioritizes the mobile experience for most of its rankings (Mobile-first indexing), so it's even more critical that your store meets the thresholds on mobile devices.

How long does it take for ranking to improve after optimizing vitals?

Ranking improvements can take between 2 and 4 weeks to fully reflect, as Google needs time to crawl, process changes, and update its indexes. Core Web Vitals data in Search Console is updated every 28 days, so you'll see the impact of your changes within that period.

Do WordPress and Shopify have the same Core Web Vitals issues?

Both platforms can have Core Web Vitals issues, although the causes may vary. In WordPress (WooCommerce), problems are often related to heavy themes, excessive plugins, or hosting configurations. In Shopify, problems often stem from third-party apps, large images, or themes with a lot of JavaScript code, as server access is more limited.

Can I improve Core Web Vitals without hiring a developer?

You can make some basic improvements such as image optimization (compressing and using modern formats) or cleaning up unnecessary plugins/apps. However, for more complex problems such as JavaScript/CSS code optimization, server configuration, or implementing lazy loading, you will very likely need the help of a developer or a technical SEO expert.