E-commerce · Shopify
Most slow Shopify stores are slowed by what was added to them. Here is what to remove and fix, in order.
Measure first, then fix
Apps are the usual culprit
Never lazy-load the hero image
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To speed up a Shopify store, work in this order: remove apps you do not need and the code they leave behind, fix the main image at the top of each page so it loads first, serve properly sized images, defer or remove third-party scripts such as chat widgets and extra tracking pixels, and simplify heavy theme features like video backgrounds and carousels. Shopify itself runs on a fast global platform, so most slow stores are slowed by what has been added to them. Shopify’s own documentation names theme code, apps, images, videos, carousels, social feeds and analytics as the features that affect performance.
Google’s “good” targets for Core Web Vitals are a Largest Contentful Paint (main content visible) of 2.5 seconds or less, Interaction to Next Paint (response to taps and clicks) of 200 milliseconds or less, and Cumulative Layout Shift (content jumping around) of 0.1 or less, measured at the 75th percentile of visits. Write down your starting numbers so you can see what each fix did.
Apps are one of the most common causes of a slow Shopify store. Many inject JavaScript on every page, even pages where the app does nothing.
On most store pages, the largest element at the top is an image: the homepage banner or the main product photo. That image usually decides your Largest Contentful Paint. Shopify’s theme performance guidance says:
Before uploading, crop images to the shape you need and avoid giant originals. Shopify’s CDN converts and resizes, but starting with sensible files helps.
Chat widgets, review carousels, heatmaps, ad pixels, affiliate trackers and social feeds all load code from other servers. Each one competes with your own content.
Not sure which apps and scripts are slowing you down?Book a free 30-minute call and we will look at your store and tell you what we would remove first.
If you work with a developer, Shopify’s performance best practices give them a clear list:
Speed slips over time as apps, campaigns and banners pile up. Recheck the performance report after every new app or theme change, and review apps and scripts every quarter. Our guide to Core Web Vitals for business owners explains the metrics in plain terms.
JLB USA builds and improves Shopify and Shopify Plus stores, and has worked with 500+ clients on 1,000+ projects over more than 15 years. We can audit your apps, scripts and theme, fix what is slowing the store, or rebuild it on a lighter theme you can still edit yourself. See our web design and e-commerce services, or our Shopify vs WooCommerce comparison if you are weighing platforms.
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Pick a time. We look at what you have now with you and tell you what we would change first. No obligation.
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Usually because of apps, third-party scripts, oversized images and heavy theme features such as sliders and video. Shopify’s platform and hosting are rarely the cause.
Many do, because they add JavaScript to every page. Remove apps you do not need and check that their leftover code is removed from the theme.
Focus on Core Web Vitals from real visitors rather than one lab score. Google’s good thresholds are LCP within 2.5 seconds, INP within 200 milliseconds and CLS of 0.1 or less.
Often, if your current theme is old or heavily customized. A current theme with fewer apps and simpler sections usually loads faster than a patched older one.
