Google Speed Metrics and Core Web Vitals

Why a green score doesn’t mean passing the Core Web Vitals Assessment

So you have developed a new website and it shows a green score on the Google Speed Test but does not pass Core Web Vitals? Let’s check your Google Search Console, you will see which pages and exactly which issue they have.

And here we come to the biggest challenge, define why Google say that:

So as you probably know Google counts these metrics on the real user experience. So let’s investigate it, you may see the hourly report as on this screen:

In case you already transfer to GA4 use this article to setup hourly comparison. In case this does not work for some reason you are always able to write to your hosting support to receive relevant data.

In most cases, the difference between peak and lowest periods of user activity is 5-6 times. Because of this, the results of server response can be different from the time when you check these metrics especially if you have some website functionality that demands real-time data to show. For example, this page has to display relevant data with departure times and quantity of available tickets. Obviously when the server needs to proceed with this data on a few pages for 10-20 users it a one story and another when it has many pages and hundreds of requests at the same time. So do research and define if your web server capacity is enough for peak user time.

There are another problem when your users struggle with slow internet. There are many regions of the World where 3G internet is still dominant. Here decision can be one – reduce the complexity of design and functionality, discover what gives more value for users and your business time of loading the first screen or design/functionality that it brings. Maybe if organic traffic is not the main resource from which visitors come to you no need to spend a budget for green metrics.

If you still struggle without a green score and want to achieve a high ranking in Google contact us (by clicking the open contact us modal window) and we will make a decision. Years of relevant experience allow us to guarantee results.

How user behavior impacts Core metrics Web Vitals

Even if a website is well optimized from a technical standpoint, audience behavior can significantly impact Core’s bottom line. Web Vitals . Users access a website from different devices, use different browsers, and work under different internet connection conditions. Because of this, the same page can display completely different results depending on the region, time of day, and device type. This is especially noticeable on high-traffic websites, where server loads fluctuate constantly.

Moreover, many website owners rely solely on lab tests, neglecting field data. Tools like PageSpeed Insights may show good results at the time of testing, but real visitors experience additional delays. Content rendering speed is affected not only by the server but also by third-party scripts, ad units, analytics, and widgets . The more such elements are connected to a page, the higher the likelihood of a degraded user experience.

To minimize the impact of user factors, it is important to regularly check:

• Website performance during peak hours;
• Speed of operation on mobile devices;
• Stability of page loading on slow internet;
• Influence of third-party services and scripts;
• Correct operation of caching and CDN.

It’s also worth keeping in mind that Google analyzes user experience over time, not just at the time of a single review. Even short-term performance issues can impact your final ranking in Search . Console . Therefore, it’s important to monitor performance trends and quickly respond to any dips. Continuous monitoring helps identify bottlenecks early and maintain stable website loading speed.

It’s also recommended to test your website on different types of devices and in various network conditions. This allows you to better understand how users interact with content in a real-world environment. Sometimes, a slight simplification of the interface or the removal of heavy visual effects yields more noticeable results than costly server-side optimization. Ultimately, user experience should always be the priority, not just achieving technical “green” metrics.

Why do laboratory test results differ from actual results?

Many developers face a situation where a site shows excellent results in synthetic tests, but continues to receive warnings from Google. Search Console . This is because lab tests are performed under controlled conditions, without real-world user scenarios. During these tests, the system uses a stable internet connection , a limited number of requests, and a predictable server load. In reality, a website may be accessed by hundreds of users simultaneously, which directly impacts performance.

Another reason for discrepancies is the differences between audience devices. Not all visitors use modern smartphones or powerful computers with high performance. For older devices, even a relatively lightweight interface can be too cumbersome, especially if the page contains animations, complex scripts, or a large number of interactive elements. Because of this, Largest scores Contentful Paint and Interaction to Next Paint may deteriorate even with good technical optimization.

It’s also important to understand that Google collects real user data gradually. If performance issues were observed several weeks ago, they may continue to impact the final score even after the bugs are fixed. That’s why Core’s results Web Vitals aren’t updated instantly. Website owners should take this into account and analyze metrics over the long term, rather than relying solely on the results of individual tests.

What changes actually help improve Core? Web Vitals

One of the most effective strategies remains optimizing critical content displayed above the fold. Users should see the main page information as quickly as possible, even if secondary elements continue to load in the background. This approach helps improve the perceived speed of the site and positively impacts user behavior. Furthermore, reducing the number of heavy images and unused scripts reduces the load on the browser and server.

of the frontend and server infrastructure is equally important . Sometimes problems arise not from design, but from unoptimized query logic, a slow database, or a large number of external integrations. This is especially true for online stores, booking services, and projects with dynamic content. In such cases, simply upgrading your hosting or implementing a CDN can provide a significant performance boost.

For the stable improvement of Core Web Vitals should pay attention to the following actions:

• Optimize images and use modern file formats;
• Minimize the number of third-party scripts;
• Implement caching of pages and static resources;
• Reduce the amount of CSS and JavaScript ;
• Use CDN to speed up content delivery.

However, perfection shouldn’t be achieved at any cost. Sometimes, over-optimization can lead to a deterioration in a website’s design, functionality, or usability. It’s important to maintain a balance between loading speed and user experience. A comprehensive approach allows you to achieve consistent results for both search engines and actual website visitors.