App Speed Report · Updated February 2026
Does Stamped Slow Down Your Shopify Store?
Speed impact analysis of Stamped (Reviews & Loyalty) — how much it affects your page load time, what scripts it loads, and how to mitigate the performance cost.
Stamped Speed Impact Summary
3
Scripts Loaded
140KB
Total Script Size
150-280ms
Avg. Load Time Impact
App Name
Stamped
Category
Reviews & Loyalty
Impact Level
Medium
How Stamped Affects Your Store Speed
Stamped.io provides product reviews, NPS surveys, and loyalty programs. It loads review widgets, star ratings, and optionally loyalty point displays across your store.
When a visitor lands on your store, Stamped loads 3 JavaScript files totaling approximately 140KB. 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 150-280ms 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 Stamped adds 150-280ms to your page load, that's a measurable impact on your bottom line.
Stamped'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
Stamped's scripts handle its core reviews & loyalty functionality on your storefront. This typically includes:
- • Core functionality script — The main JavaScript bundle that powers Stamped's features on your pages
- • Tracking/analytics script — Monitors user interactions and behavior for Stamped'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 Stamped's functionality isn't needed. A visitor browsing your blog doesn't need Stamped's full reviews & loyalty scripts loading and executing.
How to Reduce Stamped's Speed Impact
You don't have to choose between Stamped's functionality and a fast store. Here's how to minimize its performance impact while keeping the features you need:
Disable the Stamped loyalty widget on pages where it's not needed (blog, about, etc.)
Use Stamped's 'Basic' widget style for star ratings on collection pages — it's lighter than the full widget
Limit photo reviews displayed per page to reduce image loading
Disable NPS survey popups on mobile — they load additional JavaScript and hurt mobile speed scores
Only load Stamped's full review widget on product pages — use server-side star snippets elsewhere
Remove Stamped's footer banner/badge if present — it loads on every page
🔍 SEO impact: Reducing Stamped's speed impact helps your store pass Core Web Vitals — Google's official ranking signal since 2021. Better speed = higher rankings = more organic traffic.
The Bigger Picture: App Bloat on Shopify
Stamped 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 Stamped adds 150-280ms 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 Stamped), and optimizes how they all load — deferring non-essential scripts, reducing blocking time, and ensuring your critical page content loads first.
⚡ See How Stamped Affects Your Store
Thunder scans your installed apps — including Stamped — 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
Frequently Asked Questions
Does Stamped slow down Shopify stores?
Stamped has a medium speed impact on Shopify stores, typically adding 150-280ms to page load time. It loads 3 scripts totaling approximately 140KB. 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 Stamped affect my PageSpeed score?
Stamped typically reduces your PageSpeed Insights mobile score by 3-10 points depending on your store's baseline performance and other installed apps. The 140KB 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 Stamped to improve speed?
Not necessarily. Stamped provides valuable functionality (reviews & loyalty) 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 Stamped and still have a fast Shopify store?
Yes. Many high-performing Shopify stores use Stamped successfully. The key is optimization: don't load Stamped'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 Stamped's JavaScript until after your critical content has loaded. A well-optimized store with Stamped can still score 80+ on PageSpeed mobile.
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