Core Web Vitals and speed optimisation

Our Core Web Vitals optimisation service fixes the speed and stability problems that real visitors feel, and your agency delivers the result under its own brand. We start from field data, because a perfect Lighthouse score on a fast laptop says little about a mid-range phone on mobile data.

What our Core Web Vitals optimisation service fixes

Core Web Vitals has three measures, and a page passes when 75% of real visits meet each threshold. Search Console reports them from 28 days of visitor data.

Metric	What it measures	Good	Fixes we usually make
LCP (Largest Contentful Paint)	How fast the main content appears	2.5 seconds or less	Server response, image size and priority, render-blocking CSS and fonts
INP (Interaction to Next Paint)	How quickly the page responds to taps and clicks	200 milliseconds or less	Heavy JavaScript, third-party scripts, slow sliders, menus and page-builder widgets
CLS (Cumulative Layout Shift)	How much the layout jumps while loading	0.1 or less	Image dimensions, reserved space for banners and embeds, font loading

We test on throttled mobile profiles in PageSpeed Insights and WebPageTest, then confirm the change in field data. That way the report your client sees matches what their customers experience.

Why stacked speed plugins make sites slower

Several caching and optimisation plugins on one site often fight each other, because each one rewrites the same CSS and JavaScript. We remove the overlap first, then pick one approach and configure it properly.

On WordPress that usually means one caching layer such as WP Rocket, Cloudflare in front of the host, images in modern formats at the right size, and fonts served locally. On Elementor sites we switch off unused widgets and their assets. On WooCommerce we keep cart, checkout and account pages out of the page cache, so speed gains never break orders.

Third-party scripts are often where most of the delay comes from, and they need a client conversation. Chat widgets, heatmaps and forgotten tracking tags each cost load time. We list every script, what it does and who owns it, so you and the client can agree which ones stay.

When the build itself is the limit

Some sites cannot pass on their current build, however much tuning they get. Heavy themes, deeply nested page-builder sections and slow shared hosting all set a ceiling.

When we reach that ceiling, we say so in writing and give you options. A hosting change through our website migration service may be enough.

If it is not, a rebuilt template or a headless WordPress front end in Next.js keeps editors in WordPress while visitors get a faster site. For paid traffic, a separate high-speed landing page is often the fastest route.

What you get back, proof and pricing

You get a before-and-after report in your template with lab results and field data side by side.

Faster pages help visitors and the landing page side of Google Ads Quality Score, but we never promise a ranking change. Speed is one signal among many, and our technical SEO implementation handles the rest of an audit.

For a build you can test yourself, open the SEO Agency in Essex case study. Our founder built it before SoftVolt AI, with speed treated as a requirement rather than a plugin added at the end.

A performance audit and fix sprint gets a fixed price within two business days of the brief, and the rates page shows the monthly plans. This service is part of our white-label web development work.