A slow Shopify store costs you sales. Every second of load time increases bounce rates, suppresses conversion, and signals to Google that your store is not ready to rank. If your Shopify site feels sluggish, passes Core Web Vitals checks inconsistently, or simply does not convert the way it should, a professional speed and performance audit is the first step to fixing it properly.
At By Design UK, we deliver structured, technical Shopify performance audits for UK merchants and brands — identifying exactly what is slowing your store down and providing a clear, actionable remediation plan. Whether you need the audit alone or want us to implement the fixes, our Shopify services are built around fixed pricing, full transparency, and code you actually own.
Our audits go well beyond running your URL through a free online tool. We conduct a layered technical review that examines every factor affecting real-world page speed and user experience, including:
You receive a written report with prioritised recommendations, severity ratings, and estimated implementation effort. There is no jargon without explanation. Every finding is grounded in measurable data from your live store.
Google’s own research consistently shows that faster pages convert better. A Shopify store loading within two seconds on mobile can see meaningful uplifts in add-to-cart rate compared to one loading in four or five seconds. Beyond conversion, Core Web Vitals are a confirmed ranking signal — meaning a poorly performing store is directly penalised in organic search, compounding the revenue impact. An audit gives you the evidence and the roadmap to address both problems simultaneously.
Most UK merchants face an uncomfortable choice when seeking technical Shopify help. Freelancers can be affordable, but delivery is often inconsistent, documentation is sparse, and you may find yourself with no ongoing support and no real ownership of the work done. Traditional agencies, on the other hand, frequently operate on slow timelines, opaque retainer structures, and project costs that escalate without warning.
By Design UK sits intentionally between those two options. We offer the technical depth and process rigour of a full agency, with the responsiveness and pricing clarity you would expect from a specialist. Our Shopify builds range from £499 to £18,999 depending on scope, and our Shopify support plans start from £299 per month for ongoing development and maintenance. Every engagement is fixed price, agreed upfront, and you receive full source code ownership on completion — no lock-in, no hidden dependencies.
We do not just advise on performance — we build and operate production software ourselves. Tackly.co.uk is a live, multi-toolkit SaaS platform built and maintained entirely by the By Design UK team. Building and running a production platform at scale means we understand performance constraints from the inside — not just as an auditor reading a report, but as engineers accountable for real uptime, real load times, and real users. That hands-on experience directly informs every audit and implementation we deliver for Shopify merchants.
We are UK-based, operating from Office 13, 25 Mollison Avenue, Enfield, EN3 7LW. You can reach us directly at info@bydesignuk.co.uk. If you need a broader conversation about your ecommerce stack, our about page explains how we work and who we work with.
If your requirements extend beyond Shopify into custom platform territory, our SaaS development service covers bespoke builds from £18,000 upward, including full architecture, development, and post-launch support.
Most audits are completed within three to five working days. We review your live store across multiple devices and conditions, then compile a structured written report with prioritised findings. If you need implementation alongside the audit, timelines are agreed as part of a fixed-price scope.
Yes. Third-party app script load is one of the most common causes of Shopify performance degradation. Our audit identifies which installed apps are contributing unnecessary JavaScript or CSS on the front end, and recommends consolidation, deferral, or removal strategies where appropriate.
Not necessarily. In many cases, targeted code optimisations, image improvements, and app rationalisation deliver significant speed gains without a full theme rebuild. Where a rebuild is genuinely the right solution, we will say so clearly and provide a fixed price for the work.
Absolutely. Many clients commission the audit and implementation together as a single fixed-price engagement. Others prefer the audit report first and return for implementation once internal decisions are made. Either approach works, and you retain full ownership of all code produced.
Contact By Design UK today to discuss your Shopify speed audit. We will respond within one business day with a clear outline of how we can help.
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