Unused App Scripts
Unused app scripts are JavaScript files that load on every page of a Shopify store from apps that have been removed from the store admin but whose code remains in the theme. They can also refer to active apps that load scripts on pages where their functionality isn't needed.
Why It Matters for Shopify Stores
Unused app scripts are a unique Shopify performance problem. When you uninstall an app, Shopify removes it from your admin but doesn't automatically remove any code it added to your theme files. These orphaned scripts continue to load on every page, consuming bandwidth and blocking rendering — for a feature that no longer exists. We regularly find stores with 5–10 scripts from apps uninstalled 12–24 months ago still loading on every product page.
How to Check Your Store
Use our App Bloat Calculator to identify scripts from uninstalled apps. In Chrome DevTools > Sources, look for scripts from domains not matching any currently installed app. Compare your current app list to script domains loading on the page.
Use the free shopify app bloat calculator toolHow to Fix It
In Shopify Theme Editor > Edit Code, search for any Script tags or app-specific Liquid blocks referencing removed apps. Remove these manually. For apps you still use, check if they offer a Theme App Extension alternative that loads scripts only on relevant pages.
Related Terms
Shopify Apps
ShopifyShopify Apps are third-party integrations available in the Shopify App Store that add features to your store — reviews, loyalty programs, upsells, email capture, chat, and more.
Render-Blocking Resources
PerformanceRender-blocking resources are CSS or JavaScript files that prevent a browser from displaying page content until they've fully downloaded and parsed.
INP (Interaction to Next Paint)
Core Web VitalsInteraction to Next Paint measures the responsiveness of your page to user interactions — clicks, taps, and keyboard input.
Page Weight
PerformancePage weight is the total size of all resources required to load a web page — HTML, CSS, JavaScript, images, fonts, and other assets.
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