PageSpeed & Core Web Vitals Optimisation

Google ranks faster sites higher. Customers buy more on faster sites. We make e-commerce sites measurably faster — with real numbers, not vague promises.

LCP

Largest Contentful Paint — how fast your main content appears. We target under 2.5 seconds.

CLS

Cumulative Layout Shift — how much the page jumps around while loading. We target near zero.

INP

Interaction to Next Paint — how quickly the page responds when customers click or tap.

SEO Impact

Core Web Vitals are a Google ranking factor. Faster sites rank higher and get more traffic.

Real Results from a Recent Project

These numbers are from a production e-commerce store processing millions in annual revenue, optimised in April 2026.

4.3s
~2.5s

Mobile LCP

42% faster largest contentful paint

0.931
~0

CLS Score

Layout shift eliminated completely

288KB
94KB

Hero Image

67% smaller with WebP conversion

112KB
6.6KB

Thumbnails

94% smaller per product image

What We Optimise

We don't just run PageSpeed Insights and hand you a report. We fix things. Every optimisation on this list is something we've done on live production stores:

Image Optimisation

  • Automatic WebP conversion with PNG/JPEG fallback
  • Responsive image sizing — no 2000px images on a 400px screen
  • Lazy loading for below-the-fold images
  • Priority loading for hero and above-the-fold content

CSS & JavaScript

  • CSS minification and critical path optimisation
  • Deferred JavaScript loading
  • Removal of unused CSS and legacy browser code
  • Synchronous loading for render-critical stylesheets

Server-Side Performance

  • Database query optimisation and indexing
  • Removal of dead code and unnecessary database calls
  • Static caching for repeated function calls
  • PHP opcode and configuration tuning

Caching & Headers

  • Browser cache configuration (images, CSS, JS)
  • ETag optimisation
  • Expires headers for static assets
  • Preload hints for critical resources

Core Web Vitals Fixes

  • LCP — font and image preloading, render-blocking elimination
  • CLS — explicit image dimensions, stable layout on load
  • INP — JavaScript execution optimisation, event handler efficiency

Why This Matters for E-Commerce

Conversion Rates

A 1-second improvement in page load time increases conversions by up to 7% (Deloitte). For a store doing £1M/year, that's £70,000 in additional revenue.

Search Rankings

Google uses Core Web Vitals as a ranking signal. Failing scores push you down the results; passing scores give you an edge over slower competitors.

Mobile Experience

Over 60% of e-commerce traffic is mobile. Mobile connections are slower, so optimisation has a bigger impact where most of your customers are.

Bounce Rate

53% of mobile visitors abandon a site that takes over 3 seconds to load (Google). Every second counts.

Pricing

We offer two approaches depending on what you need:

Audit & Report

From £250

Full PageSpeed and Core Web Vitals analysis with prioritised recommendations. You get a report you can act on — or hand to us to implement.

Audit & Fix

From £750

We audit your site and implement the fixes. Includes before/after measurements so you can see exactly what improved and by how much.

Ongoing Performance

From £200/month

Monthly performance monitoring and optimisation as part of a support contract. Includes regression checks after updates.

How Fast Is Your Site?

Send us your URL and we'll run a free initial PageSpeed check. No obligation — you'll get your scores and a summary of the biggest opportunities within 24 hours.

Get Your Free Speed Check