Core Web Vitals have an impressive impact on website performance, and their metrics serve as a valuable database for making decisions. Knowing what metrics affect your website more and tracking them on time gives you a strategic benefit as well. Dive in and see what’s really impacting your website’s performance and online reputation right now.

What are Core Web Vitals?

Core Web Vitals is a set of metrics that measures the user experience quality with your website. It includes page load speed, interactivity, and visual stability indicators. Identifying which metrics perform effectively and which require improvement enables businesses to optimize their website proactively and deliver a seamless, interactive user experience. 

In simple words, they were created with website owners in mind who can monitor website performance and make smart moves towards its excellent work.

The most essential Core Web Vitals metrics include the following:

• Largest Contentful Paint (LCP). The load speed of the core visual element on a web page. For example, when a user hits your site and the first screen loads a video or image carousel, that’s the most visible part of the website. This indicator shows how fast it loads, so users don’t have to wait long and scroll the page down. 
• Interaction to Next Paint (INP). The time of the web page’s reaction to some users’ actions. Like clicks, scrollings, engagement with visuals, etc. It must work as a blink of the eye. Click, and you get what you want.   
• Cumulative Layout Shift (CLS). Visual stability, or how much the page elements “shift” during loading.  

Business owners, alongside SEO specialists and marketers, use Google Search Console to check Core Web Vitals indicators and make suggestions on website performance. 

Why are they important in 2025?

Because Core Web Vitals metrics are part of the Page Experience signal, which is considered in Google’s search algorithms. It’s one of the core indicators of a website’s technical quality. If it provides positive results, that’s a sign for Google that the site is optimized and user-friendly, and it shows them frequently in search queries to more people. 

On top of that, Core Web Vitals use only real user monitoring data. They don’t guess, they pull real data on how users interact with your site and its individual elements, giving a big-picture view of what’s engaging and what’s driving results. Or, what doesn’t perform as it should and needs adjustments. 

Website optimization to improve Core Web Vitals

The proven way of how to improve Core Web Vitals is through its vital metrics – LCP, INP, and CLS. 

Improving LCP means optimizing the load speed of the biggest visuals on the start page. The best indicator you should strive for – page load within the first 2.5 seconds. For this purpose, check that CDN and modern HTTP/2, HTTP/3 protocols work well, because they are responsible for network and hosting. Next, check that the browser receives the CSS and JS quickly. They also affect how fast pages and their elements are loaded. For performance improvement, images should not only be compressed but also converted to modern formats, such as WebP or AVIF. And the last advice here – off-screen images should use lazy loading to minimize initial load times, making the experience seamless for everyone.

According to INP, here users should get an immediate reaction after the action they take. Click, and the page pops up just right. Scroll, and all website element downloads in milliseconds. Click back to the main page, and here we are. According to the Google guide, the perfect figure is less than 200 milliseconds. To deliver such website usability, all heavy scripts should be split up, loaded asynchronously, or deferred. If your site has repetitive actions like forms or menus, caching and Service Workers can seriously speed up response times.

And finally, visual stability. The perfect CLS score is less than 0.1. Technically important to always reserve space for graphic elements: images, videos, banners, and even fonts. Give the browser a heads-up about where each block will sit so nothing shifts around while loading. Web fonts can cause awkward delays, so use font-display: swap to show text right away, even before the font finishes loading.

How does website performance impact user experience?

To answer this question, we offer to picture your own experience while using a website. First, you click on it and wait for the first page….but magic does not happen. An irritating circle appears on a screen, and it seems like you will never see the first page. A few seconds later, it finally downloaded. But the next struggle is to scroll it, because it pops up and doesn’t show the full page to see. When you decide to go to the menu, it also demonstrates its “quality”. The menu button doesn’t work, and the other buttons also require more time to let you go to another website page. Does it form your positive user experience? We guess, no. 

It works in the same way for people who use your website. Give them the most from using it – fast page load, adaptive design for mobile devices, and interactive elements that work and are displayed clearly without delays or failures. 

What we want to convey here is that the website performance is not just a technical parameter; it’s a key factor that drives trust, user comfort, and long-term financial success.

How do Core Web Vitals impact SEO rankings?

The first thing you should keep in mind is that Google uses Core Web Vitals metrics as a part of Page Experience. An indicator that shows how user-friendly and productive the website is from an SEO perspective. If the website page loads fast, elements stay stable, and interactions happen without lag – search engines recognize it as a good user experience. As a result, it rewards the website with higher rankings in Google search.

This means that the Core Web Vitals optimization becomes a part of the promotion and SEO strategy for every business. We say “every business” because every other company runs its business online, where a website works both as a business card and as a platform to deliver services or sell goods. Good Core Web Vitals metrics are not just about speed, but about search engine trust, higher rankings, and ultimately more organic traffic.

How do load speed and LCP impact online business conversions?

Users today don’t like to wait. That’s why if the biggest website visual part appears super slowly – they will leave. No matter how attractive and profitable your offer is, if you haven’t thought through how your website will present it to users, you are unlikely to see any conversions. Every second of delay affects the user’s decision to go away; that’s why development teams put this as a prior point while building a highly effective website. 

Another reason why load speed matters is that it creates a feeling of unprofessionalism. It seems like the website was put together without thinking ahead about user behavior or the experience it delivers. And in contrast, a fast website creates a sense of reliability, so users stay on the page longer. They interact with the content, and are more likely to convert into customers. In other words, investments in page speed Core Web Vitals optimization directly translate into financial results for the business.

Why are CLS and visual stability important for user experience?

Cumulative Layout Shift (CLS) and visual stability directly affect the user’s feeling of control over the site. When page elements “jump” while loading, buttons shift, and text moves, it doesn’t add points to the user experience. In fact, users accidentally click where they didn’t intend to, lose track of the site’s logic, and leave it. These unexpected shifts are frustrating and make the experience feel inconsistent. Even when the content itself is valuable.

A stable layout, in contrast, helps users quickly find the data they need and interact with buttons and forms as they want. Only this increases comfort, trust, and willingness to stay on the site or make a purchase.

What is FID in website usability?

First Input Delay (FID) is an indicator that evaluates the speed of the site’s response when the user interacts with it first time. For example, when the user opens a new website and starts taking some actions, FID begins gathering performance metrics. It measures the time, in milliseconds, between a user’s interaction and the moment the browser begins processing that input. So, in fact, this indicator helps track users’ interactions and site performance from the first visit, providing companies with valuable figures and statistics. 

FID is important for usability, since even if a page loads fast and looks good, a delay in the first action creates a sense of sluggishness. Users may become frustrated, leave the page, lose trust in the brand, and will never come again.

In 2025, Google replaced FID with INP (Interaction to Next Paint) metric, which measures all interactions, not just the first one. The concept is still the same – a fast website should respond instantly to user actions.

What tools and metrics are used to effectively measure Core Web Vitals?

To get accurate data on the Core Web Vitals metrics, we advise using the following tools. 

• Google PageSpeed Insights gives detailed data from both real users and laboratory metrics. Here you can see LCP, INP, and CLS metrics for a specific page, as well as optimization recommendations, if needed.
• Lighthouse allows you to run tests locally or via CI/CD, simulating mobile networks and devices. It checks loading speed, layout stability, and interactivity before users see the site. You get the data to proceed with and include it in the site improvement plan. 
• Real User Monitoring (RUM) is used for real-time monitoring. This can be Google Analytics 4 with additional web-vitals collection, or specialized services. They collect metrics from real visitors and help you see how your site performs in different browsers and on different devices.

What are the common Core Web Vitals mistakes for websites in 2025?

Сore Web Vitals can identify various mistakes, connected with website speed, interactivity, and stability. But the common ones from them include the following list: 

• Mobile performance is often overlooked. In other words, a website may work well on a desktop, but performance drops significantly on a smartphone with slower internet or a weaker device. 
• Scripts, plugins, and third-party widgets slow things down. Large JS volumes or loading scripts dramatically affect the website’s performance. 
• Images and media without optimization or modern formats. Large files, lack of lazy loading, and incorrect sizes slow down the Largest Contentful Paint (LCP) metric. 
• The page content jumps as it loads. Like when banners or ad blocks appear after loading, without specified dimensions. This affects Cumulative Layout Shift (CLS). 

How does improving Core Web Vitals impact website revenue growth?

We’ve already identified the core insight – Core Web Vitals determine how comfortably users interact with your resource. If the page loads quickly (LCP), the website responds instantly to actions (INP), and the layout stays stable (CLS), visitors stay engaged, click through more pages, and become your brand advocates. 

A high-quality user experience converts over time into higher average check, more repeat orders, and revenue growth. In other words, investing in page speed Core Web Vitals optimization and other metrics translates into real financial results for your business.

Insights from TRIARE experts on Core Web Vitals optimization

As a web service provider, we deeply know how to improve Core Web Vitals metrics and how to track them to identify pain points when they don’t affect the website’s productivity much. The following pieces of advice you can use right away that surely bring you financial and technical benefits for your website and the business you run. 

• We also recommend paying special attention to the mobile experience. Since many users browse websites from phones and tablets, delays in loading or “jumping” elements are more noticeable there. Hence, you need to make sure your server, CDN, image formats, and compression are mobile-ready.
• Another important aspect is real user interaction. Testing a website on good WiFi or in a lab is good, but it is even more important to see how the website works for different users and networks. Therefore, use tools such as Google Analytics to track user behavior. 
• If banners or blocks load after the main content and “push” everything down, it creates a poor UX. We recommend reserving space for such elements right away and using width/height attributes to avoid unexpected changes in the interface.
• Lastly, ongoing post-launch support is crucial for maintaining website performance. Thus, continuously monitor CWV metrics, update scripts, and optimize new elements to improve its productivity. 

Conclusion

Technical issues may arise suddenly, when you don’t even know that something is going wrong. That’s where the biggest value Core Web Vitals brings. It notifies you on time about any changes and shows where improvements must be made. It gives you both technical and financial advantages, as the top-performing websites visit more and have the highest conversion levels. That’s why it makes sense to start tracking your website key metrics right away. 

We’re talking about this because we already worked with it and assessed the key metrics that are responsible for smooth website performance. We know what to do when some of the metrics go down and how to prevent further website instability. If you’re facing any of the issues we’ve discussed here, reach out to us – we’ll help you plan and start improving your website. In the right hands, it will perform exactly as it should.