Core Web Vitals Optimisation
Core Web Vitals are the specific loading, responsiveness and layout stability numbers Google records from real visitors on your site. GullySystem finds which one is failing and why, then fixes the exact cause on each affected page.
The Three Numbers Google Actually Measures
Largest Contentful Paint
How long the main content of a page takes to appear, measured from real visitor devices rather than a lab test.
Interaction to Next Paint
How quickly the page responds once a visitor taps a button or types, which shows up as a page that loads fine but feels sluggish to use.
Cumulative Layout Shift
How much the page jumps around as it finishes loading — an image appearing late and pushing a button down just as someone was about to tap it.
Why These Fail Even on Pages That Load 'Fine'
A page can look complete on a fast office connection while a real visitor on a mid-range phone experiences a delayed tap response or a layout that keeps shifting as ads and images arrive late. Vitals are measured on that real-world traffic, which is why a page can seem fine in the office and still fail in the field data Google collects.
Fixing Each Vital
Improving Largest Contentful Paint
Prioritising the main image or text block to load first, reducing what blocks it, and serving images sized correctly for the device.
Improving Interaction to Next Paint
Breaking up long-running scripts so the browser can respond to a tap in between, and reducing the amount of work done on every keystroke or click.
Improving Cumulative Layout Shift
Reserving space for images, ads and embedded content before they load, so nothing already on screen has to move when they arrive.
Field Data Versus Lab Data
A lab test run once from a single location tells you how a page behaves under one set of conditions. Field data, gathered from your actual visitors over time, is what search engines use to judge your vitals, which is why fixes are validated against both — a lab score that improves but does not move the field data has not solved the real problem.
What This Does and Does Not Do for Search Ranking
Vitals are one input among many search engines weigh, so improving them helps but is not a promise of a ranking change on its own — content and relevance still matter more. The more dependable gain is behavioural: visitors on slow connections stay on a page long enough to read it and complete an action, rather than leaving before it settles.
Frequently asked questions
Is this the right service if we don't yet know which vital is a problem for us?
Yes — identifying which of the three is actually failing, and on which pages, is the first step of the engagement itself, not something you need to diagnose beforehand. If none of them are genuinely failing, we would tell you that rather than manufacture work.
How do you know which vital is actually failing for us?
From field data — either your existing Google Search Console reporting or data we set up to collect it — rather than a single lab test, since a page can pass in the lab and still fail for real visitors on real devices.
Can one page fail Core Web Vitals while another on the same site passes?
Yes, and this is common. A product listing page with many images behaves very differently from a simple content page, so vitals are assessed and fixed per page template rather than as one number for the whole site.
What determines the cost and how long it takes to fix our vitals?
Which vitals are failing, on how many page templates, and whether the cause is within your own code or introduced by third-party scripts such as ad networks or chat widgets that you do not control directly — a shift caused by your own layout is quicker to resolve than one caused by a script you do not maintain.
Do third-party scripts like ads or chat widgets affect our vitals?
Often significantly, particularly layout shift and responsiveness. Where a third-party script is the cause, options include loading it later, reserving space for it in advance, or discussing the impact with whoever manages that script.
Who owns the code changes made to improve our vitals?
You do. Fixes are made directly in your site's own templates and codebase, so the improvement stays in place and stays yours regardless of who maintains the site afterwards.
What do you need from us to start improving our vitals?
Access to Search Console or existing field data if you have it, access to the site's code and template structure, and a list of which pages carry the most traffic, since that is where improving vitals matters most.
Tell us what you need.
Send a short brief and one of our engineers will come back to you — usually the same day.
- No obligation
- We reply the same working day
- Your details stay private