Core Web Vitals Specialists
Core Web Vitals optimization that fixes the cause.
Core Web Vitals optimization by a senior team in Amsterdam and New York: loading, response and layout jumps, each fixed at the cause.
- Data from real Chrome visitors, not a laptop test
- Each score fixed at its own root cause
- Monthly speed scorecard, split by device
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SEO for Google and AI
Found in Google, ChatGPT, Perplexity and AI Overviews
Core Web Vitals optimization from a senior SEO agency in Amsterdam and New York
Most agencies hand you a lab score from their own laptop. Meanwhile your real visitor scores in Google stay Poor. We find the cause behind each failing score and fix it in your website itself.
Most agencies hand you a lab score from their own laptop. Meanwhile your real visitor scores in Google stay Poor. We find the cause behind each failing score and fix it in your website itself.
LASEO is a 100% SEO agency in Amsterdam and New York. Core Web Vitals are Google's three scores for how fast a page loads, how quickly it responds and how much the layout jumps, measured on real Chrome visitors over 28 days. Our Core Web Vitals optimization services start with that real visitor data, not a lab test on a developer's laptop. We find the cause of each failing score, fix it in your website's code and track the result in a monthly scorecard. It is part of our site speed and technical SEO work.
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Core Web Vitals optimisation that moved real visitor scores from Poor to Good
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fixes each Core Web Vital at its cause: slow loading, slow responses to a tap and layouts that jump, measured on real visitors, not on a laptop in a lab.
Slow loading, slow responses and layout jumps each have a different cause. Slow loading usually comes from a file that blocks the page or a slow server, slow responses from long pieces of JavaScript, layout jumps from fonts or images without a set size. We diagnose them separately, fix them separately and keep measuring, so the next website update does not undo the work.
Part of Technical SEO. Related services: Hreflang Implementation, Mobile SEO, Site Speed and Website Migration.
How a Core Web Vitals engagement runs
How a LASEO Core Web Vitals engagement runs
Five phases over 10 to 14 weeks. A baseline from real visitor data, fixes at the root cause of slow loading, slow responses and layout jumps, then ongoing monitoring so the next website update does not undo the work.
- 01
Real visitor baseline (week 1)
We pull your real visitor data from Google's Chrome User Experience Report: the 28-day score for your whole site, plus page-level data for your top 20 organic landing pages. We compare it with the Core Web Vitals report in Google Search Console. You get a baseline scorecard with your loading, responsiveness and layout scores for the whole site and per page, split by mobile and desktop.
- 02
Loading speed: cause and fix (week 2-4)
Largest Contentful Paint (LCP) is the time until the main content appears. We find what holds it back with Chrome's developer tools and PageSpeed Insights. Typical fixes: load the hero image first, convert it to a lighter modern format (AVIF or WebP) at the right size for each screen, put a fast delivery network in front of your images and files, and cut the time your server takes to respond, for example through caching.
- 03
Responsiveness: cause and fix (week 5-8)
Interaction to Next Paint (INP) is the time between a click or tap and the screen responding. We record slow tasks while simulating a slower processor. Typical fixes: split long pieces of JavaScript into chunks under 50ms, delay scripts that are not needed straight away, move heavy work to the background so the page stays responsive, and check your tag manager for outside scripts that block clicks.
- 04
Layout jumps: cause and fix (week 9-11)
Cumulative Layout Shift (CLS) measures how much the page jumps around while it loads. We find the elements that move with Chrome's developer tools and PageSpeed Insights. Typical fixes: give every image and video a fixed width and height, load web fonts so text does not resize, reserve space for ads and embedded content, and never insert content above what the visitor is already reading.
- 05
Ongoing monitoring and monthly scorecard (ongoing)
We add Google's official speed measurement to your site and send the results to Google Analytics or a separate dashboard, split by device, country and page type. Every month you get a one-page scorecard with the changes in your scores, the alerts that fired and the next fixes lined up. We go through it with your lead developer.
One root cause per score,not a generic speed report.
Slow loading, slow responses and layout jumps each have completely different causes. Slow loading usually comes from a file that blocks the page or a slow server. Slow responses usually come from a long piece of JavaScript that runs when someone clicks. Layout jumps usually come from a font swapping in or an image without a set size. We diagnose them separately and fix each one separately.
What our CWV clients say
Core Web Vitals work in their own words
Our CWV were red on mobile and costing us rankings. LASEO worked through LCP, INP and CLS systematically and we have been in the green for ages now.
INP was the silent killer we ignored. LASEO weighed, lazy-loaded and deferred third-party scripts and our percentiles dropped noticeably.
LASEO knows the difference between lab and field scores. They drove our CWV via CrUX, not Lighthouse, and the ranking effect showed up fast.
Our CWV were red on mobile and costing us rankings. LASEO worked through LCP, INP and CLS systematically and we have been in the green for ages now.
INP was the silent killer we ignored. LASEO weighed, lazy-loaded and deferred third-party scripts and our percentiles dropped noticeably.
LASEO knows the difference between lab and field scores. They drove our CWV via CrUX, not Lighthouse, and the ranking effect showed up fast.
Google and AI search
Found in Google, and in the answers AI gives
More and more buyers ask ChatGPT, Perplexity or Google's AI Overviews before they click on anything. We make sure your brand shows up there too: as a source AI quotes and a brand it recommends.
More about AI SEOWhere your buyers search
- ChatGPT
- Google AI Overviews
- Perplexity
- Gemini
- Copilot
Your free audit shows whether ChatGPT and AI Overviews mention you.
- 01
Answers AI wants to quote
Clear answers, facts and sources on your pages, so AI tools pick your site as the source.
- 02
A site AI can read
A clean technical base that tells AI tools exactly what you sell and who it is for.
- 03
Mentioned in the right places
Reviews, press and trusted sites: the signals AI uses to decide which brands to recommend.
- 04
Measured, not guessed
We test the questions your buyers ask and track how often AI tools mention you, next to your Google rankings.
Honest answers about Core Web Vitals optimisation
What tech leads and SEO buyers actually ask before starting a Core Web Vitals engagement.
About LASEO
Question not listed?
A senior specialist is happy to answer it. Request your free audit, or call us directly.
Core Web Vitals are Google's three scores for user experience, measured on real Chrome users. LCP (Largest Contentful Paint) measures loading speed: Good is under 2.5 seconds. INP (Interaction to Next Paint) measures how fast the page responds to clicks and taps: Good is under 200 milliseconds. CLS (Cumulative Layout Shift) measures how much the layout jumps: Good is under 0.1. For each score, at least three in four visits must meet the threshold, measured over a 28-day window in the Chrome User Experience Report. Google uses them as a small but real ranking signal. You need all three at Good to pass.
No. INP replaced FID (First Input Delay) as a Core Web Vital on 12 March 2024. FID only measured the delay on the very first interaction, which often looked better than reality, because most pages handle the first tap well. INP looks at the slowest interaction during the whole visit, so a click that triggers 400ms of work on an 'Add to cart' button now really counts. Most sites that passed FID fail INP. Fixing it means splitting long pieces of JavaScript, delaying scripts that are not essential and moving heavy work to the background.
Core Web Vitals have been a confirmed Google ranking signal since the 2021 page experience update, but a fairly small one next to stronger signals like relevant content and links. Think of it as a tie-breaker between similar competitors. In our experience, the bigger commercial reason to fix Core Web Vitals is conversion rate: on online shops, loading 1 second faster typically lifts conversion by 5 to 15 percent, which is far more than the SEO benefit. Treat Core Web Vitals as a user experience and revenue lever first and an SEO lever second, and you will prioritise it correctly.
The Chrome User Experience Report gives two views. The Origin score combines Core Web Vitals across every page on your domain that had real Chrome visitors in the last 28 days. The URL score is per page, but Google only publishes it if that page gets enough visits (usually a few thousand a month). Your site-wide loading time can be 3.2 seconds while your top organic landing page loads in 1.8 seconds, or the other way round. We improve both, but put the page-level data first for the page types that bring in your organic traffic, because that is what moves your business results.
Honestly, no. Anyone who guarantees a Good score is misrepresenting how these scores work. The data comes from real Chrome visitors, so it depends on your traffic mix (share of mobile, countries, types of device), your hosting, your outside scripts and how often you release changes. We commit to specific fixes with the improvement we expect from our diagnosis, set up measurement so you see the real change, and keep fixing until the scores turn Good. We turn 90 percent of Poor site-wide scores into Good, but we will not put a guarantee on a score we do not fully control.
Free Core Web Vitals audit
Get your free Core Web Vitals auditfrom a speed specialist.
Free and without obligation. A speed specialist pulls up your real visitor data and sends you an expert report on what holds your scores back in Google and AI search, with the likely cause of each problem and what to fix first. No sales pitch. And if we are not the right team to fix it, we will tell you.