Shopify Performance Optimisation Agency UK

Q: What is a Shopify performance optimisation agency?

A Shopify performance agency specialises in making Shopify stores load faster — diagnosing app bloat, fixing Core Web Vitals, optimising themes and media, and keeping stores fast as they grow. At Futur we combine this with design, development and CRO, so speed improvements translate into conversion improvements.

Q: Why is my Shopify store slow after installing apps?

Most Shopify apps load their own JavaScript on every page, even where the app isn't used. Each one adds requests and render-blocking code, and many leave leftover scripts in your theme after uninstalling. In our audits, a large share of app code is typically removable without losing any functionality.

Q: Do apps slow my store down even after I uninstall them?

Often, yes. Uninstalling removes the app from your admin but frequently leaves orphaned code in your theme files. This builds up over years and is one of the most common causes of slow Shopify stores.

Q: Custom Shopify theme vs page builder — which is faster?

A well-built custom theme is almost always faster. Page builders generate heavy, generic code to cover every possible use case; a custom section is written for one job. Rebuilding builder-heavy pages as custom sections is one of the biggest single speed wins available.

Q: How do I improve Core Web Vitals on Shopify?

Focus on the three metrics Google measures: LCP under 2.5s, INP under 200ms and CLS under 0.1. On Shopify the biggest levers are image optimisation, reducing app JavaScript, deferring non-critical scripts and fixing layout shift in your theme.

Q: How do I keep my Shopify store fast as it grows?

Treat speed like a budget. Vet every new app against its performance cost, strip leftover code when apps go, keep media optimised, and monitor Core Web Vitals monthly. Our support plans exist for exactly this.

Q: Is speed optimisation actually worth the money?

Google and Deloitte's research found a 0.1s mobile speed improvement lifted retail conversions by 8.4% and average order value by 9.2%. For most stores, speed work pays for itself faster than any other technical investment.

Q: Will you tell me if I don't need it?

Yes. If the audit shows your store is already fast and the gains would be marginal, we'll say so — and the audit findings are yours to keep either way.

Shopify Performance Optimisation Agency UK

We're a UK Shopify agency that makes slow stores fast — and keeps them fast as you grow. App bloat audits, Core Web Vitals fixes, theme rebuilds and ongoing performance support, all with measurable before-and-after results.

Get Free Shopify Audit

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Speak directly with the founder. No sales team. No pressure.

A mobile phone mock up of a shopify website

A laptop mock up of a shopify store designed for ride bike wales

Why ambitious Shopify brands choose Futur for performance optimisation

+18%

Average conversion uplift after a Shopify redesign

20+

Shopify stores designed and built

<2s

Average page load times across stores we build

5★

Average client review rating

95%+

Mobile usability score on stores we deliver

Years building on Shopify

Need help?

Drop us a message and we will be glad to help

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Shopify Performance

Why Is Your Shopify Store Slow?

Most Shopify stores do not become slow overnight. Performance usually drops as apps, tracking scripts, page builders, theme edits and oversized media build up over time.

Book a Strategy Call

App bloat

Every app injects its own JavaScript, often on every page, whether it's used there or not. Ten apps can easily add 1MB+ of render-blocking scripts. Uninstalling doesn't always help either — many apps leave leftover code in your theme.

Theme Debt

Years of tweaks, duplicate code, unused snippets and tracking scripts nobody remembers installing. It builds up silently until every page carries the weight.

Every 0.1s Costs You Sales

Google and Deloitte's "Milliseconds Make Millions" study found a 0.1s mobile speed improvement lifted retail conversions by 8.4% and average order value by 9.2%. Slow stores don't just rank lower — they lose orders daily.

Sources: web.dev — Milliseconds make millions, Think with Google report PDF, Deloitte Ireland

Page builders

Drag-and-drop builders generate heavy, generic code. A custom-built section does the same job with a fraction of the weight

Oversized Media

Large product images, uncompressed banners and autoplay media can add seconds to mobile load times. We optimise image sizing, formats, lazy loading and media delivery so your store stays fast without sacrificing design.

Shopify app bloat slowing down your ecommerce store?

Shopify app bloat happens when apps add JavaScript, CSS and tracking code to your storefront, often across every page. This increases page weight, delays interactions and can hurt Core Web Vitals. Futur Media audits app embeds, leftover code and third-party scripts to remove bloat without removing the features your store needs.

How you build your store
decides how fast it runs

Page Builder

Theme + Apps

Custom Build

Speed

Code weight

Heavy — generic code for every use case

Medium — grows with each app

Lean — written for one job

Render-blocking scripts

High

Medium–high

Minimal

Core Web Vitals

Hard to pass

Depends on app count

Built to pass from day one

Typical load time

4s+

2.5–4s

<2s

COST & CONTROL

Monthly app fees

£20–100+/mo forever

Stacks up per app

Mostly none — features built in

Leftover code on uninstall

✗ stays in your theme

✓ nothing to leave behind

Full design control

✗

Limited

✓

Services

How We Make Shopify Stores Fast

From app bloat audits and Core Web Vitals fixes to custom theme builds, we find what's slowing your store down — and fix it for good.

Book a Strategy Call

WHY Futur

A Performance-First Shopify Agency

Speed isn't a one-off project. Every store we build ships in under 2 seconds, and every store we optimise gets a documented before-and-after — real Lighthouse and CrUX numbers, not screenshots of a synthetic score taken at midnight.

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Cyclist riding a black and gold Trek road bike on a paved road at sunset.

Abstract black and white wavy striped 3D shape surrounded by floating spheres on a green gradient background with a white wireframe grid.

Our Approach

Futur is a specialist Shopify agency built around one belief: fast stores sell more. We combine performance engineering, design and CRO to fix slow Shopify stores — and to build new ones that never get slow in the first place.

As a smaller, founder-led team, you work directly with the people doing the work. No account managers relaying messages — just straight answers about what's actually slowing your store down, and what it'll take to fix it.

Evidence, not promises

Every optimisation ships with a documented before-and-after — real Core Web Vitals data, so you see exactly what changed and what it was worth.

Shopify-first expertise

We specialise exclusively in Shopify, helping brands move faster, scale smarter and unlock more from the platform.

Fast stays fast

We don't hand over and disappear. Monitoring and ongoing support protect the gains as you add apps, campaigns and content.

LET’S TALK

Got a slow Shopify store?

Whether it's crawling after years of apps, failing Core Web Vitals, or just slower than it should be — send us your URL and we'll take a look. Free speed audit, no obligation.

We recently partnered with Futur to develop our new website, and the experience has been excellent. Their deep technical knowledge and strategic understanding of e-commerce and the Shopify platform gave us complete confidence throughout the entire process. If you are looking for a skilled developer who truly understands how to build a high-performing online store, I highly recommend Futur

— Stuart Davies

Founder of Ride Bikes Wales

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The tools we build with

We only integrate best-in-class Shopify apps — the partners we'd stake our reputation on.

Work

Our Latest Projects

Migration

Bespoke Shopify Build & CRO

View Project

Onest Energy Shopify & Recharge Build

Shopify

Migration & Custom Build

View Project

Ridebike Wales Shopify Migration

Campervan Coffee Co Shopify Migration

Ace Radiators Shopify Build

Don't take our word for it.
Ask AI about us.

Get an honest, no-sales-pitch rundown of what we do — straight from ChatGPT, Claude, Perplexity or Gemini. Tap one and ask away.

Process

Our Shopify Performance Process

Every project starts with data and ends with proof. Here's how it works.

Audit & Benchmark

We baseline your store with Lighthouse and real-user Core Web Vitals data, inventory every app, and review your theme code. You see exactly what's slow, why, and what each fix is worth.

Fix & Rebuild

We work through the list by impact: quick wins first — script cleanup, image optimisation, leftover app code — then structural fixes like rebuilding heavy sections or replacing bloated apps.

Monitor & Protect

Speed decays if nobody's watching. We re-benchmark after launch and keep monitoring, so new apps and campaigns don't quietly undo the gains.

Ready to Fix a Slow Shopify Store?

Book a strategy call or request a free speed audit — we'll show you exactly what's slowing your store down and what it's costing you.

Get Free Shopify Audit

Book a Strategy Call

FAQ

Shopify Performance FAQs

What is a Shopify performance optimisation agency?

A Shopify performance agency specialises in making Shopify stores load faster — diagnosing app bloat, fixing Core Web Vitals, optimising themes and media, and keeping stores fast as they grow. At Futur we combine this with design, development and CRO, so speed improvements translate into conversion improvements.

Why is my Shopify store slow after installing apps?

Most Shopify apps load their own JavaScript on every page, even where the app isn't used. Each one adds requests and render-blocking code, and many leave leftover scripts in your theme after uninstalling. In our audits, a large share of app code is typically removable without losing any functionality.

Do apps slow my store down even after I uninstall them?

Often, yes. Uninstalling removes the app from your admin but frequently leaves orphaned code in your theme files. This builds up over years and is one of the most common causes of slow Shopify stores.

Custom Shopify theme vs page builder — which is faster?

A well-built custom theme is almost always faster. Page builders generate heavy, generic code to cover every possible use case; a custom section is written for one job. Rebuilding builder-heavy pages as custom sections is one of the biggest single speed wins available.

How do I improve Core Web Vitals on Shopify?

Focus on the three metrics Google measures: LCP under 2.5s, INP under 200ms and CLS under 0.1. On Shopify the biggest levers are image optimisation, reducing app JavaScript, deferring non-critical scripts and fixing layout shift in your theme.

How do I keep my Shopify store fast as it grows?

Treat speed like a budget. Vet every new app against its performance cost, strip leftover code when apps go, keep media optimised, and monitor Core Web Vitals monthly. Our support plans exist for exactly this.

Is speed optimisation actually worth the money?

Google and Deloitte's research found a 0.1s mobile speed improvement lifted retail conversions by 8.4% and average order value by 9.2%. For most stores, speed work pays for itself faster than any other technical investment.

Will you tell me if I don't need it?

Yes. If the audit shows your store is already fast and the gains would be marginal, we'll say so — and the audit findings are yours to keep either way.

Shopify Performance Guides

Shopify App Bloat: Why Your Store Is Slow After Installing Apps

Article

Shopify Custom Theme vs Page Builder: Which Is Faster?

Article

How to Improve Shopify Core Web Vitals: LCP, INP and CLS Fixes

Article

How to Keep a Shopify Store Fast as It Grows

Article

Ready When You Are