Picture yourself on your phone, trying to look at a restaurant's menu. The page opens, but the menu takes forever to appear. When it finally does, you go to tap "Book a table" and the page shifts down at the last second, so you tap the wrong thing. Within a few seconds you close the site and try the next result.
Your own website may look like that to some of your visitors. On your own phone with fast internet, you would never notice. But a patient trying to book an appointment from a crowded train with a weak signal has a very different experience. Google measures this experience and calls it Core Web Vitals. The short answer to what are core web vitals is this: three scores that measure how your website feels to a visitor.
The three scores: what is Google looking at?
The three scores have technical names, but what matters to a business owner is what they mean in daily life. I will give the abbreviations only once and then stick with plain names:
- Opening speed: how long does it take for the biggest part of the page, usually the main photo or a large headline, to show up on screen? The technical name is largest contentful paint (LCP).
- Response speed: when you tap a button or a menu, how quickly does the site react? The technical name is interaction to next paint (INP).
- Page stability: do text and buttons jump around while the page loads? The technical name is cumulative layout shift (CLS).
Here are the thresholds Google treats as "good":
| Score | What it means day to day | "Good" level |
|---|---|---|
| Opening speed | When does the main content appear? | 2.5 seconds or less |
| Response speed | How long do you wait after a tap? | 200 milliseconds or less |
| Page stability | Does the page jump? | Almost no movement |
For page stability Google uses a small number (0.1 or lower is good), but you can simply read it as "no jumping".
How do these scores affect your business?
Think of a shop window. If the door is hard to open, few people will come in. If the shelves move around once they are inside, they feel uneasy. A website works the same way.
These are the three outcomes I see most often with the clients I work with:
- Visitors give up before the page opens, and you never know, because someone who leaves does not fill in a form or leave a trace.
- The call button or the WhatsApp icon appears late, and in the meantime the person moves on to your competitor.
- Someone taps the wrong thing because the page jumped, gets annoyed, and trusts your business a little less.
So this is not about pleasing Google. It is first of all about not losing real customers.
The effect on rankings, without exaggeration
There is a lot of hype around this topic, so let me be straightforward. These three scores are only one of dozens of signals Google looks at when ranking pages. Even perfect scores will not put your site in first place. Whether your content answers what people are searching for, whether your site is trustworthy, and whether other sites refer to you all weigh much more.
But the reverse is also true: if your scores are poor, you take a small disadvantage in rankings and, more importantly, you lose the people who do arrive. So think of these scores not as "what wins the race" but as "what should not trip you up during it".
What you can check yourself
You do not need technical knowledge for any of this:
- Try it on your own phone. Turn off Wi-Fi and open your site on mobile data. How long does the home page take? Does it react when you tap? Does it shift around?
- Type your address into Google's free tool, PageSpeed Insights. On the results page you will see your three scores in green, amber or red. Green is good, amber can be improved, red is a problem.
- Look at Search Console. If your site is added to Google Search Console, the "Core Web Vitals" section shows which pages have problems. It reflects what real visitors experienced, so it is the most reliable source.
- Test the page that brings in the most customers, not just the home page. Often a service or contact page is heavier than the home page.
What the specialist does
When the scores come out poor, a web developer or SEO specialist does the fixing. These are the things that usually come up:
- Shrinking oversized images, so the main content shows up sooner.
- Cutting back unnecessary plugins, ad scripts and tracking codes. Each one makes the page a little heavier.
- Reserving space for images and ad areas in advance, so the page stops jumping as it loads.
- Checking whether the server, the computer where your site's files are kept, is adequate.
Ask the specialist: "Which page has which poor score? What is the real cause? After you fix it, with which tool and on what date will we measure again?" A good specialist gives concrete answers and does not make blanket promises like "I will make everything fast".
How long does it take?
On a simple business site, shrinking images and a few settings can be done in a day or two. If there is a heavy plugin setup or an old site platform, the work can stretch into weeks, and sometimes rebuilding the site makes more sense. One more thing to know: the real-visitor data in Search Console does not change right after a fix, because Google collects roughly the last month of experience. Be patient.
Frequently asked questions
If my Core Web Vitals scores are red, will Google remove me from the results?
No. A red score does not delete your site from the listings. But over time a poor experience means both a small ranking disadvantage and lost customers. Think about the lost visitors first.
Can I fix these scores myself?
Measuring is easy, but fixing usually needs technical work. If your site was built with a ready-made system, some settings may be simple, but changing things without knowing what they do can break the site. Having a specialist do it is safer.
Why do my mobile and desktop scores differ?
Phones have slower processors and weaker connections, so mobile scores are usually lower. Since most of your customers probably come from phones, give priority to the mobile score.
How often should I check my scores?
Once every three months is enough. Also do a quick check whenever a new plugin, a large image or an ad code is added to your site.
Conclusion
Knowing your site's three scores lets you see it through your visitor's eyes. Do not expect miracles in rankings, but do not let your site lose customers at the door either. If you would like to go through your scores together and clarify what needs fixing, you can reach me through my SEO services page.