Boosting Shopify Performance for a Growing Fashion Brand

After a full 7-day performance overhaul, we boosted the brand’s mobile speed from 38 to 87, cut load time from 4.9s to 1.3s, reduced bounce rate by 32%, and increased average order value by 22%, turning a slow Shopify store into a fast, conversion-driven shopping experience.

How we turned a slow, conversion-killing storefront into a fast, mobile-first shopping experience

When the founders of a growing DTC fashion brand reached out to us, their main concern was performance. Their Shopify store looked visually appealing, but it struggled where it mattered most: speed, mobile usability, and checkout stability. Slow loading times were driving away customers, pages were heavy, scripts were duplicated, and the mobile layout was breaking on multiple devices. The brand invested heavily in paid traffic, yet a significant portion of users abandoned the site before even reaching the product page.
During our initial consultation, we immediately saw the core issues — the store was overloaded with third-party apps, uncompressed media files, unused code blocks, and an outdated theme structure. Over 70% of their visitors were on mobile devices, but the site scored only 38/100 in mobile PageSpeed tests, causing major losses in add-to-cart and checkout completion. The checkout itself had occasional delays due to unoptimised scripts loading in the background.
We proposed a full technical optimisation. Our team rebuilt the theme structure, removed unnecessary apps, merged duplicated scripts, cleaned unused CSS, and converted all product images to WebP. We also reworked the mobile layout to ensure that product pages loaded instantly and that the performance bottlenecks were eliminated. Additionally, we implemented a lightweight upsell module and enabled one-tap payment options like Apple Pay and Google Pay to boost checkout completion.
The entire optimisation process took 7 days, including testing, debugging, and mobile fine-tuning. Within the first week after launch, the brand saw a noticeable improvement in user behaviour. The mobile PageSpeed score increased from 38 to 87, desktop performance reached 94/100, and the time to interactive dropped from 4.9 seconds to just 1.3 seconds. These improvements directly impacted the business: the average order value grew by 22% thanks to upsells, and 14% of all new orders were completed via Apple Pay within the first month.
The result was a store that finally matched the brand’s ambition — fast, stable, mobile-first, and optimised for real purchasing behaviour. With a significantly reduced bounce rate and a smoother checkout process, the company now converts a much higher percentage of its paid traffic and spends less to acquire each customer.

Key Metrics After the Optimisation

  • 7 days — full optimisation cycle
  • 38 → 87 mobile speed score
  • 79 → 94 desktop speed score
  • 4.9s → 1.3s time to interactive
  • –32% bounce rate reduction
  • +22% average order value
  • 14% of orders via Apple Pay in the first month
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