JavaScript & App Deferral

Load Scripts Only When Needed

Delay non-essential JavaScript and Shopify apps until after critical content has loaded.

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What It Does

Hyperspeed intelligently defers JavaScript and Shopify apps that aren't required for the initial page render. Scripts are loaded only when they're needed - either after critical content is displayed or when a user begins to interact with the page.

This advanced technique includes app scope control, allowing you to decide exactly which apps should load on which pages, eliminating unnecessary scripts completely on pages where they aren't used.

How It Works

Without JavaScript Deferral

JavaScript blocks rendering as it loads and executes, delaying the display of your store content and slowing down user interaction.

All scripts load simultaneously
Blocks page rendering during load
Consumes bandwidth for unused features
All apps load on every page

With JavaScript Deferral

Critical content loads first, with non-essential scripts loading only when needed, creating a faster, more responsive experience.

Critical content loads immediately
Scripts load non-blocking
Apps load only when needed
Page-specific app loading

Why It Matters

JavaScript is often the biggest performance bottleneck for Shopify stores. The average store loads 1MB+ of JavaScript, much of which isn't needed for the initial page view. Every app you install adds more scripts that load on every page - even when they're not being used.

By intelligently deferring non-essential JavaScript and controlling app loading, you dramatically reduce initial load times and improve all Core Web Vitals metrics.

Faster Initial Load

Prioritize rendering visible content first, showing users what they need to see without waiting for all scripts.

Improved Time to Interactive

Reduce JavaScript execution time, allowing users to interact with your store faster with less processing lag.

Reduced Resource Usage

Minimize bandwidth and processing power used, especially important for mobile visitors with limited resources.

Safety and Control

App compatibility is our top priority. We've engineered our JavaScript deferral to work smoothly with Shopify apps while giving you full control.

App-by-App Control

Customize which apps are deferred through an easy-to-use interface, with options to disable deferral for specific apps if needed.

Compatibility Testing

Built-in compatibility with hundreds of popular Shopify apps, with regular updates to ensure smooth performance with new apps.

One-Click Disable

Turn off JavaScript deferral with a single click if you encounter any unexpected behavior with specific apps or features.

Frequently Asked Questions

App optimization defers third-party app scripts so they load only when user action is detected. This prevents app scripts from blocking your initial page load, dramatically improving perceived speed.

Hyperspeed supports thousands of apps, including popular apps like Klaviyo, Judge.me, Privy, Yotpo, Loox, and Stamped.io. App compatibility is continuously updated.

Most apps work perfectly. Some apps may not work in preview mode but will work after publishing. If an app stops working, disable App Optimization or customize settings for that specific app.

Yes. App optimization can be customized per app and per page, giving you granular control over which scripts are deferred.

Smart JS Deferral defers safe third-party and Shopify scripts. Aggressive JS Deferral also defers analytics scripts - this may affect your analytics tracking but provides maximum speed improvement.