Services
Core Web Vitals Optimisation: LCP, INP and CLS
Core Web Vitals are the three metrics Google uses to gauge how real visitors experience a page: how quickly the main content appears, how quickly it responds to input and whether things jump around while loading. This service is for sites where Search Console reports issues with LCP, INP or CLS.
Core Web Vitals
- Google Search Console
- PageSpeed Insights
- Lighthouse
- Chrome DevTools
- Chrome UX Report
- WebP
01
What you get
Field data analysis
The Core Web Vitals report in Search Console and real-user data show which groups of pages have issues.
LCP: the main content
Getting the largest element on screen faster, usually a hero image or headline above the fold.
INP: responsiveness
Less heavy JavaScript, so menus, buttons and filters respond straight away to a tap or click.
CLS: a stable layout
Space reserved for images, banners and fonts, so content does not jump around while the page loads.
Validation in Search Console
Once fixes are in place, a fix validation is started in Search Console and the outcome is tracked.
02
Process
Field data
Which metrics and which page groups fail the thresholds, on mobile and desktop.
Lab testing
Reproducing the problem with Lighthouse and Chrome DevTools to pin down the exact cause.
Template-level fixes
Fixes go into the templates, so every page of that type is fixed at once.
Validation
Starting a fix validation in Search Console and monitoring until new visitor data comes in.
03
Why it matters
Technology
- Google Search Console
- PageSpeed Insights
- Lighthouse
- Chrome DevTools
- Chrome UX Report
- WebP
- AVIF
A good fit for
- Sites with "poor" URLs in the Core Web Vitals report
- Pages with a large hero image or slider above the fold
- Sites where menus and filters react sluggishly
- Pages where content jumps around while loading
- Online stores running lots of scripts and extensions
A better experience for visitors
Pages appear sooner, respond immediately and do not shift buttons from under your finger.
One of Google's signals
Core Web Vitals are among the page experience signals that Google takes into account.
Driven by real data
Decisions are based on data from real visitors, not just a single lab score.
What Core Web Vitals measure
Core Web Vitals are not a general speed score. They are three separate metrics, each with its own threshold. Google assesses them using data from real visitors, which is why a site that scores well in a lab test can still show problems in Search Console.
| Metric | What it measures | Good result |
|---|---|---|
| LCP | When the largest element above the fold is displayed | 2.5 seconds or less |
| INP | How quickly the page responds to a click, tap or key press | 200 milliseconds or less |
| CLS | How much content shifts around while loading | 0.1 or less |
LCP: the largest element
This is most often the hero image or slider at the top of the page. What helps: a lighter format such as WebP or AVIF, preloading that specific file and removing lazy loading from it, since lazy loading helps images further down the page but hurts the first one.
INP: responsiveness
INP replaced the older FID metric and measures the response to every interaction, not just the first. Problems usually stem from heavy JavaScript: page builders, sliders and third-party chat and analytics scripts. The fix is less code, loaded later.
CLS: stability
Content jumps when images have no set dimensions, when a cookie banner pushes content down, or when a web font swaps in after loading. The fixes are usually small, but they need to go into the templates.
How this differs from general speed optimisation
Speed optimisation makes the site faster overall. Core Web Vitals work is narrower: it starts from the specific issues in Search Console and ends with validating the fix there. The two often go hand in hand, and both support your SEO. If Search Console is flagging issues, send us your site address through the project inquiry form.
FAQ
Frequently asked questions
Why does PageSpeed Insights look fine while Search Console shows a problem?
A lab test is a single simulation, while Search Console uses data from real visitors on different devices and connections. The Search Console assessment is the one Google takes into account.
How long until Search Console shows an improvement?
Real-visitor data is collected over a rolling period of several weeks, so validating a fix is not instant.
What is INP and why did it replace FID?
INP measures how quickly a page responds to every interaction during a visit, whereas FID only looked at the first one. That gives a more accurate picture of responsiveness.
Do better Core Web Vitals improve Google rankings?
They are one of many signals Google uses. On their own they do not guarantee a higher ranking, but they improve the visitor experience and remove one obstacle.
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