Improving LCP, INP and CLS without optimising a number for its own sake
Core Web Vitals provide a common language for talking about loading, responsiveness and visual stability. They are useful when they lead to a better real-world experience.
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LCP: loading the main content
For LCP, we analyse in particular the main resource, the network path and rendering.
INP: responsiveness to interactions
For INP, we look for the processing that blocks interaction.
CLS: visual stability
For CLS, we identify the elements whose size or position changes after they are displayed.
The goal remains a pleasant, predictable website, not a perfect score achieved at the expense of useful features.
The thresholds set by Google
Google considers that a page offers a good experience when at least 75% of real visits meet these thresholds: main content displayed in 2.5 seconds or less, response to interactions in 200 milliseconds or less, and cumulative layout shift of 0.1 or less.
Field data and lab data
Field data comes from visitors’ Chrome browsers; you find it in the “Core Web Vitals” report in Google Search Console, calculated over the last 28 days. Lab data (Lighthouse) simulates a visit: it is used to diagnose and to verify a fix, but field data is what counts. An improvement therefore takes several weeks to show fully in Search Console.
Typical fixes
- LCP: main image compressed, sized and loaded with priority, a faster server, caching.
- INP: scripts split up, long tasks deferred, third-party scripts loaded after interaction.
- CLS: space reserved for images, ads and banners, fonts loaded without layout shift.
Frequently asked questions
Do Core Web Vitals affect search rankings?
They are part of the page experience signals, but they do not make up for weak content. Their main value is commercial: a fast, stable page converts better.
My site has no field data: what can I do?
Low-traffic sites do not always have enough visits to appear in Chrome’s data. We then work with lab measurements and, if needed, real-user measurement installed on the site.
Our Core Web Vitals packages
LCP, INP and CLS diagnosis
on quotation
To understand the Search Console report.
- analysis of field and lab data
- affected pages and templates
- causes ranked by impact
- costed fix plan
Fixes
on quotation
To get your pages into the green.
- main image, fonts and cache
- split and deferred scripts
- reserved space against layout shifts
- verification in Search Console
Ongoing monitoring
on quotation
To stop a new feature from pulling the scores back down.
- monthly monitoring
- alerts on regressions
- fixes included in maintenance
- regular report
Each package is tailored to your website after the free 30-minute discovery call. Send us your website address and receive a free, detailed quote.
Our commitments
- Reply within 24 business hours to every enquiry.
- Free 30-minute discovery call, followed by a free detailed quote valid for 30 days.
- A single point of contact: the developer who builds your project, self-employed since 1999.
- You own the code, the access credentials and the content once the project is paid for.
- 3-month warranty: defects reported after launch are fixed free of charge (terms).
- Staged payments available: 30% deposit on order, then a payment schedule suited to the project.
- Response within 4 business hours in case of an outage or hack, for clients on a maintenance contract.
- Projects run in English or French, for businesses in France and abroad.
Core Web Vitals to improve?
Share the pages and metrics concerned: we will identify what is really weighing on the experience.
What happens next?
- You describe your project in a few lines.
- We reply within 24 business hours to schedule a free 30-minute call.
- You receive a detailed quote: scope, price, schedule and payment plan.
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