App Speed Report · Updated March 2026
Does Wishlist Plus Slow Down Your Shopify Store?
Speed impact analysis of Wishlist Plus (Wishlist) — how much it affects your page load time, what scripts it loads, and how to mitigate the performance cost.
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Wishlist Plus Speed Impact Summary
2
Scripts Loaded
85KB
Total Script Size
100-200ms
Avg. Load Time Impact
App Name
Wishlist Plus
Category
Wishlist
Impact Level
Low
How Wishlist Plus Affects Your Store Speed
Wishlist Plus by Swym adds wishlist/save functionality with heart icons on product cards and a dedicated wishlist page. Its script load is relatively light.
When a visitor lands on your store, Wishlist Plus loads 2 JavaScript files totaling approximately 85KB. These scripts need to be downloaded, parsed, and executed by the browser — all of which takes time and competes with your core page content for network bandwidth and CPU resources.
The measured impact is 100-200ms of additional page load time. To put that in perspective: Google research shows that each additional 100ms of load time reduces conversion rates by up to 7%. If Wishlist Plus adds 100-200ms to your page load, that's a measurable impact on your bottom line.
Wishlist Plus has a relatively low speed impact compared to other Shopify apps. If you're looking to improve speed, focus on higher-impact apps first before optimizing Wishlist Plus.
What These Scripts Do
Wishlist Plus's scripts handle its core wishlist functionality on your storefront. This typically includes:
- • Core functionality script — The main JavaScript bundle that powers Wishlist Plus's features on your pages
- • Tracking/analytics script — Monitors user interactions and behavior for Wishlist Plus's dashboard and reporting
The problem isn't that these scripts exist — it's that they often load synchronously and on every page, even pages where Wishlist Plus's functionality isn't needed. A visitor browsing your blog doesn't need Wishlist Plus's full wishlist scripts loading and executing.
How to Reduce Wishlist Plus's Speed Impact
You don't have to choose between Wishlist Plus's functionality and a fast store. Here's how to minimize its performance impact while keeping the features you need:
Wishlist Plus is one of the lighter apps — focus optimization on higher-impact apps first
Ensure the wishlist script only loads on pages where heart icons are displayed
Use Wishlist Plus's lightweight mode for product card icons instead of the full widget
Disable wishlist sharing features if customers don't use social sharing
Verify the app isn't loading on blog, about, or policy pages unnecessarily
🔍 SEO impact: Reducing Wishlist Plus's speed impact helps your store pass Core Web Vitals — Google's official ranking signal since 2021. Better speed = higher rankings = more organic traffic.
Quick Optimization Checklist for Wishlist Plus
Complete these steps to minimize Wishlist Plus's speed impact
The Bigger Picture: App Bloat on Shopify
Wishlist Plus is just one app on your store. The average Shopify store has 15-25 apps installed, and each one adds its own JavaScript and CSS to your storefront. The cumulative effect is what really kills your speed score.
Think about it: if Wishlist Plus adds 100-200ms and you have 10+ other apps each adding 100-400ms, your total third-party script overhead could be 2-5 seconds. That's the difference between a store that converts and one that loses visitors before the page even loads.
Manually optimizing each app's loading behavior is time-consuming and requires technical knowledge. You'd need to edit theme files, understand JavaScript loading patterns, and constantly monitor for regressions when apps update their scripts.
This is exactly the problem Thunder was built to solve. Thunder automatically scans every app on your store, measures each one's actual speed impact (including Wishlist Plus), and optimizes how they all load — deferring non-essential scripts, reducing blocking time, and ensuring your critical page content loads first.
⚡ See How Wishlist Plus Affects Your Store
Thunder scans your installed apps — including Wishlist Plus — and shows you exactly how much each one impacts your speed. Then it fixes them automatically.
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Frequently Asked Questions
Does Wishlist Plus slow down Shopify stores?
Wishlist Plus has a low speed impact on Shopify stores, typically adding 100-200ms to page load time. It loads 2 scripts totaling approximately 85KB. While this isn't negligible, you can mitigate the impact by deferring its scripts, limiting which pages it loads on, and using a speed optimization app like Thunder to manage its loading behavior.
How much does Wishlist Plus affect my PageSpeed score?
Wishlist Plus typically reduces your PageSpeed Insights mobile score by 3-5 points depending on your store's baseline performance and other installed apps. The 85KB of JavaScript it loads contributes to longer Time to Interactive (TTI) and potentially affects Largest Contentful Paint (LCP) if scripts block rendering. The actual impact varies — stores with fewer apps will notice it more.
Should I uninstall Wishlist Plus to improve speed?
Not necessarily. Wishlist Plus provides valuable functionality (wishlist) that likely benefits your store. Instead of uninstalling, optimize how it loads: defer non-critical scripts, limit it to pages where it's needed, and use Thunder to automatically manage its loading priority. Only uninstall if you're not actively using the app or if the speed cost outweighs the business value.
Can I use Wishlist Plus and still have a fast Shopify store?
Yes. Many high-performing Shopify stores use Wishlist Plus successfully. The key is optimization: don't load Wishlist Plus's scripts on pages where they're not needed, compress your images to offset the script overhead, and use a tool like Thunder to defer Wishlist Plus's JavaScript until after your critical content has loaded. A well-optimized store with Wishlist Plus can still score 80+ on PageSpeed mobile.
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