App Speed Report · Updated March 2026
Does Crazy Egg Slow Down Your Shopify Store?
Speed impact analysis of Crazy Egg (Analytics & Heatmaps) — how much it affects your page load time, what scripts it loads, and how to mitigate the performance cost.
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Crazy Egg Speed Impact Summary
2
Scripts Loaded
160KB
Total Script Size
180-350ms
Avg. Load Time Impact
App Name
Crazy Egg
Category
Analytics & Heatmaps
Impact Level
High
How Crazy Egg Affects Your Store Speed
Crazy Egg provides heatmaps, scroll maps, A/B testing, and session recordings. Its tracking script monitors user behavior on every page where it's installed.
When a visitor lands on your store, Crazy Egg loads 2 JavaScript files totaling approximately 160KB. 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 Crazy Egg adds 180-350ms to your page load, that's a measurable impact on your bottom line.
As a high-impact app, Crazy Egg is likely one of the top speed offenders on your store. This doesn't mean you should uninstall it — analytics & heatmaps functionality is important — but you should prioritize optimizing how it loads.
What These Scripts Do
Crazy Egg's scripts handle its core analytics & heatmaps functionality on your storefront. This typically includes:
- • Core functionality script — The main JavaScript bundle that powers Crazy Egg's features on your pages
- • Tracking/analytics script — Monitors user interactions and behavior for Crazy Egg'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 Crazy Egg's functionality isn't needed. A visitor browsing your blog doesn't need Crazy Egg's full analytics & heatmaps scripts loading and executing.
How to Reduce Crazy Egg's Speed Impact
You don't have to choose between Crazy Egg's functionality and a fast store. Here's how to minimize its performance impact while keeping the features you need:
Enable Crazy Egg only on pages you're actively testing or analyzing
Disable A/B testing scripts on pages without active experiments — they still load the testing framework
Reduce session recording sample rate to minimize network overhead
Defer Crazy Egg's script loading to after DOMContentLoaded
Remove Crazy Egg between testing cycles — reinstall when you need new data
Use Crazy Egg's page targeting instead of site-wide installation
🔍 SEO impact: Reducing Crazy Egg'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 Crazy Egg
Complete these steps to minimize Crazy Egg's speed impact
The Bigger Picture: App Bloat on Shopify
Crazy Egg 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 Crazy Egg 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 Crazy Egg), and optimizes how they all load — deferring non-essential scripts, reducing blocking time, and ensuring your critical page content loads first.
⚡ See How Crazy Egg Affects Your Store
Thunder scans your installed apps — including Crazy Egg — 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 Crazy Egg slow down Shopify stores?
Crazy Egg has a high speed impact on Shopify stores, typically adding 180-350ms to page load time. It loads 2 scripts totaling approximately 160KB. 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 Crazy Egg affect my PageSpeed score?
Crazy Egg typically reduces your PageSpeed Insights mobile score by 3-15 points depending on your store's baseline performance and other installed apps. The 160KB 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 Crazy Egg to improve speed?
Not necessarily. Crazy Egg provides valuable functionality (analytics & heatmaps) 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 Crazy Egg and still have a fast Shopify store?
Yes. Many high-performing Shopify stores use Crazy Egg successfully. The key is optimization: don't load Crazy Egg'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 Crazy Egg's JavaScript until after your critical content has loaded. A well-optimized store with Crazy Egg can still score 80+ on PageSpeed mobile.
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