App Speed Report · Last Updated March 29, 2026
Does Loox Slow Down Your Shopify Store? Speed Impact Report (2026)
Speed impact analysis of Loox (Photo Reviews) — how much it affects your page load time, what scripts it loads, and how to mitigate the performance cost.
See How Loox Affects YOUR Store
Enter your store URL and get a detailed speed report in seconds
Free · No signup required · Results in 30 seconds · See all speed test tools
Loox Speed Impact Summary
3
Scripts Loaded
165KB
Total Script Size
180-350ms
Avg. Load Time Impact
App Name
Loox
Category
Photo Reviews
Impact Level
Medium
How Loox Affects Your Store Speed
Loox is Shopify's leading visual reviews app, specializing in photo and video reviews with built-in referral programs. It powers social proof for tens of thousands of stores with features like review carousels, star rating widgets, happy customer galleries, and AI-powered review management. With 3 scripts totaling 165KB, Loox sits in the medium-impact range — heavier than Judge.me (85KB) but lighter than Yotpo (240KB). The main performance concern: Loox loads its review widgets and popup notification toast on every storefront page, even pages without reviews displayed. The popup widget alone adds unnecessary JavaScript and DOM elements to cart, collection, and blog pages where review popups serve little purpose. For stores that rely heavily on visual social proof, the speed trade-off is often worth it — but there are clear ways to reduce the overhead without losing functionality.
When a visitor lands on your store, Loox loads 3 JavaScript files totaling approximately 165KB. 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 180-350ms 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 Loox adds 180-350ms to your page load, that's a measurable impact on your bottom line.
Loox's medium impact means it's contributing noticeably to your load time but isn't the worst offender. Combined with other apps, however, the cumulative effect can be significant.
What These Scripts Do
Loox's scripts handle its core photo reviews functionality on your storefront. This typically includes:
- • Core functionality script — The main JavaScript bundle that powers Loox's features on your pages
- • Tracking/analytics script — Monitors user interactions and behavior for Loox's dashboard and reporting
- • UI/widget scripts — Renders visual elements like popups, widgets, or embedded components on your storefront
The problem isn't that these scripts exist — it's that they often load synchronously and on every page, even pages where Loox's functionality isn't needed. A visitor browsing your blog doesn't need Loox's full photo reviews scripts loading and executing.
How to Reduce Loox's Speed Impact
You don't have to choose between Loox's functionality and a fast store. Here's how to minimize its performance impact while keeping the features you need:
Disable the Loox popup/toast notification widget — it loads JavaScript on every page even when not displaying a review notification
Only enable Loox widgets on product pages and the homepage — remove it from cart, collection, and blog pages where reviews don't drive conversions
Use Loox's 'Compact' widget layout to reduce the number of review images loaded initially — fewer images = faster initial render
Compress review photos through Loox's settings — customer-uploaded photos are often unoptimized 2-5MB images that should be 50-100KB
Disable the Loox referral widget if you're not actively running a referral program — it loads additional JavaScript for referral tracking
Set the review carousel to load a maximum of 5 reviews initially with a 'load more' button instead of rendering all reviews at once
Consider Judge.me (85KB) as a lighter alternative if you don't need Loox's visual gallery features — it's 49% smaller
🔍 SEO impact: Reducing Loox'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 Loox
Complete these steps to minimize Loox's speed impact
The Bigger Picture: App Bloat on Shopify
Loox 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 Loox adds 180-350ms 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 Loox), and optimizes how they all load — deferring non-essential scripts, reducing blocking time, and ensuring your critical page content loads first.
⚡ See How Loox Affects Your Store
Thunder scans your installed apps — including Loox — and shows you exactly how much each one impacts your speed. Then it fixes them automatically.
Install Thunder Free →Free plan available · Scans all your apps · No code changes required
What Merchants Say
★★★★★
"Our PageSpeed score went from 34 to 82 without removing a single app. Thunder handled everything automatically."
James M.
Fashion & Apparel
★★★★★
"We were about to uninstall half our apps to fix speed. Thunder saved us the hassle — all apps running, score above 80."
Sarah K.
Health & Beauty
★★★★★
"Setup took 30 seconds. Our LCP dropped from 4.2s to 1.8s. Best $20/month we spend."
David R.
Home & Garden
Frequently Asked Questions
Does Loox slow down Shopify stores?
Loox has a medium speed impact on Shopify stores, typically adding 180-350ms to page load time. It loads 3 scripts totaling approximately 165KB. 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 Loox affect my PageSpeed score?
Loox typically reduces your PageSpeed Insights mobile score by 3-10 points depending on your store's baseline performance and other installed apps. The 165KB 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 Loox to improve speed?
Not necessarily. Loox provides valuable functionality (photo reviews) 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 Loox and still have a fast Shopify store?
Yes. Many high-performing Shopify stores use Loox successfully. The key is optimization: don't load Loox'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 Loox's JavaScript until after your critical content has loaded. A well-optimized store with Loox can still score 80+ on PageSpeed mobile.
More App Speed Reports
high impact · 200-400ms
Does Judge.me Slow Shopify? →low impact · 100-200ms
Does PageFly Slow Shopify? →high impact · 300-600ms
Does Yotpo Slow Shopify? →high impact · 250-450ms
Does Stamped Slow Shopify? →medium impact · 150-280ms
Does Oberlo Slow Shopify? →low impact · 50-100ms