Shopify speed optimisation service
Slow Shopify stores lose rankings and checkout revenue. We audit app bloat, heavy themes, and oversized images, then implement fixes that show up in PageSpeed Insights and on your revenue dashboard.
If your Shopify speed score is stuck below 50 on mobile, every extra second of delay is costing you add-to-cart clicks — especially on product and collection pages where intent is highest.
Trusted by ecommerce teams who need measurable PageSpeed and Core Web Vitals gains.
Google uses page experience signals — including Core Web Vitals — when ranking stores in search. A sluggish Shopify site can slide down search results even when your products, reviews, and ad creative are strong. The rankings problem is silent: you rarely see a penalty notice, just gradual organic traffic decline.
On mobile, shoppers abandon slow product pages before they add to cart. Milliseconds matter: a one-second improvement in mobile load time has been shown to lift conversion rates by 7–10% for mid-market ecommerce stores. Theme sections, review widgets, chat tools, and tracking scripts accumulate fast on both Shopify and Shopify Plus.
The root issue on most stores is app sprawl. Each app you install from the Shopify App Store injects JavaScript and CSS into every page — whether that page needs the app or not. Ten apps running on your home page is common, and each one adds round-trip network requests, main-thread work, and potential layout shift before your hero image even loads.
When competitors invest in performance and you do not, you pay twice: once in lost organic traffic and again in higher paid acquisition costs, because slow landing pages receive lower Quality Scores and cost more per click.
53%
of mobile users leave
if a page takes more than 3 seconds to load — and most Shopify stores on unoptimised themes exceed that threshold on mobile.
7–10%
conversion lift per second saved
A one-second improvement in mobile load time produces measurable revenue uplift for ecommerce stores, according to Google's research.
10+
apps on the average store
Most Shopify stores have at least ten installed apps, each adding JavaScript that fires on every page regardless of relevance.
Focused improvements for Online Store 2.0 themes, apps, and checkout performance.
We audit every installed app's JavaScript footprint using a network waterfall and browser profiling. Non-critical scripts — reviews, loyalty points, chat widgets — are deferred until after the page becomes interactive, cutting main-thread blocking time without removing any functionality your shoppers rely on.
Product and hero images are the most common LCP culprit. We convert uploads to WebP, add explicit width and height attributes to prevent layout shift, and implement Shopify's native srcset API so mobile devices receive appropriately sized images rather than a 3,000-pixel JPEG at every viewport.
We audit your theme's liquid templates for unused sections, render-blocking stylesheet includes, and CSS loaded for disabled features. Critical above-fold styles are inlined so the first paint happens without a full stylesheet download, and defer attributes are applied to non-critical CSS links.
The hero image on your home and collection pages is almost always the Largest Contentful Paint element. We add a preconnect hint to Shopify's CDN domain and a preload link for the hero asset so the browser fetches it at the highest priority before it discovers it in the HTML.
Checkout is where revenue is made or lost. We reduce the number of third-party scripts firing on cart, checkout, and thank-you pages, consolidate pixel events through Google Tag Manager, and validate that no script is blocking the checkout form from becoming interactive.
Theme fonts frequently add two to four network requests that block text rendering. We reduce Google Fonts variants to the minimum required, switch to `font-display: swap`, and preload the single most-used font weight to eliminate invisible-text flashes and layout shift during load.
Collection and search result pages are high-traffic but often uncached because of dynamic product availability. We configure edge caching rules with appropriate cache-control headers and stale-while-revalidate policies so repeat visitors and crawlers get instant responses.
We address each metric directly: LCP by optimising hero images and reducing TTFB; INP by profiling main-thread tasks from review, chat, and filter scripts; CLS by fixing app injections that insert banners or pop-up overlays after the page visually settles.
Shopify's own CDN and infrastructure are genuinely fast — the platform itself is not the problem. What slows stores down is what merchants add on top. Every theme section, third-party app, review widget, loyalty programme, live chat tool, and marketing pixel competes for browser resources. On mobile networks, those resources arrive sequentially, and the browser cannot paint the page until blocking scripts resolve. The result is an LCP (Largest Contentful Paint) time that exceeds Google's 2.5-second threshold even when your hosting is faultless.
Shopify's Online Store 2.0 architecture gives themes more flexibility but also more surface area for bloat. Section-based themes can load CSS and JavaScript for sections that are disabled or not rendered on a given template. A product page should not load the CSS for a homepage announcement bar, but without careful liquid templating, it often does. Combined with uncompressed product images — frequently uploaded at 5–10 MB originals — and a checkout page running four separate tracking pixels, the performance debt adds up to scores that frustrate both Google and shoppers.
Fixing Shopify performance is not about disabling features — it is about loading the right things at the right time. App scripts can be deferred until after the page is interactive. Images can be converted to WebP and served with responsive srcset attributes via Shopify's built-in image transformation API. Critical CSS can be inlined so the above-fold render happens without waiting for a full stylesheet download. These changes compound: each one shaves hundreds of milliseconds, and together they can move a store from a failing Core Web Vitals assessment to a passing one.
Representative outcomes from optimization projects. Your results depend on stack and traffic.
Fashion DTC brand
Before
PageSpeed 38
After
PageSpeed 81
Load time cut 2.4s on mobile product template
Supplements store
Before
LCP 4.8s
After
LCP 2.1s
App script deferral and image CDN optimisation
Home goods merchant
Before
Organic sessions −12%
After
Organic sessions +18%
After six-week Core Web Vitals stabilisation programme
We run a deep speed and Core Web Vitals audit on your key templates — home, collection, product, and checkout where relevant. Every issue is ranked by its impact on real user experience and revenue.
We implement prioritised fixes: images, scripts, caching, and theme or app bloat — focused on revenue pages first. Each change is tested in staging and measured against a baseline.
You get ongoing checks so regressions from new apps, themes, or campaigns are caught before they hurt SEO and sales. Alerts fire when scores drop below your target threshold.
Explore our speed optimization services
Straight answers about timelines, risk, and what to expect.
PageSpeed optimisation service to increase your PageSpeed Insights score on mobile and desktop. Fix low scores with a clear, prioritised plan backed by Lighthouse data.
Learn more →Core Web Vitals fix service to improve LCP, INP, and CLS scores. We diagnose failing metrics and implement changes that help SEO and real-user experience.
Learn more →WooCommerce performance optimisation to speed up your store, fix slow checkout, and improve Core Web Vitals. Get a free store speed audit with prioritised fixes.
Learn more →Run a free speed test or book an audit. We will show exactly what is slowing your store and what to fix first.