Free Speed Test for Your Shopify Store
See exactly what's slowing your store and how to fix it. Powered by Google PageSpeed Insights.
Free · No signup · Results in ~30 seconds · Powered by Google PageSpeed Insights
+8.4%
conversions per 0.1s faster
2.5×
more sales for 1s vs 5s load
32%
more bounce at 3s load time
-7%
conversions per 1s slower
Sources: Google/Deloitte 2020, Google/SOASTA 2017
Did you know?
A 1-second delay in page load reduces conversions by 7%.
Analysis Failed
Results for
Real-World Performance (from Chrome users)
Based on real visits from Chrome users over the last 28 days. This is the data Google uses for rankings.
Lab vs. Real-World Comparison
Your store is passing Core Web Vitals — great for SEO rankings.
Speed changes over time as you add apps, update themes, and run campaigns. Thunder monitors your Core Web Vitals daily and alerts you if anything degrades, so you never lose rankings without knowing.
Monitor My Store →No real-world data available yet
This site doesn't have enough Chrome traffic for Google to report field metrics. The lab results below still help identify optimization opportunities.
Largest Contentful Paint
Core Web Vitals are an official Google ranking signal.
Source: Google/Deloitte 2020
Source: Google/SOASTA 2017
Core Web Vitals
Issues Found
What You Can Do
Thunder can automatically fix 0 of 0 issues found above.
Most stores see a 20–40 point improvement. Free plan available.
Get automated optimization →Free plan · No credit card · 1-click install on Shopify
Why Test Your Shopify Store Speed?
Page speed isn't just a technical metric — it directly impacts your revenue. Google has confirmed that page speed is a ranking factor, and research consistently shows that faster-loading stores convert significantly better than slow ones.
Speed = Revenue
per 0.1s faster
Studies from Google and Deloitte show that even a 0.1-second improvement in load time can increase conversions by 8%. On the flip side, if your store takes more than 3 seconds to load, over 50% of mobile visitors will leave before seeing a single product.
50%
of mobile visitors bounce at 3+ second load times
Sources: Google/Deloitte 2020, Google/SOASTA 2017
Speed = Google Rankings
Google ranking signal
Google uses Core Web Vitals as a ranking factor for search results. Our tool uses Google's PageSpeed Insights API to measure the same metrics Google uses for search rankings:
- Largest Contentful Paint (LCP) — How quickly your main content becomes visible. Under 2.5s is "good."
- First Contentful Paint (FCP) — When the first element renders. Under 1.8s is ideal.
- Cumulative Layout Shift (CLS) — How much your page shifts while loading. Under 0.1 is the target.
- Total Blocking Time (TBT) — How long JavaScript blocks interaction. Under 200ms is good.
Source: Google Search Central 2021
The Real Cost of a Slow Store
on an average Shopify store
For Shopify merchants, speed is especially critical. The average Shopify store loads dozens of third-party scripts from apps like Klaviyo, Judge.me, Loox, and page builders. Each script adds weight to your page, competing for bandwidth and processing power on your customers' devices.
Common culprits: Klaviyo email popups, Judge.me reviews, Loox photo reviews, page builders, chat widgets, upsell apps — each adding 50-500KB of JavaScript.
What Thunder Does Differently
PageSpeed improvement
After running the test, you'll see specific recommendations. The most impactful changes for Shopify stores typically involve optimizing how third-party scripts load. You can do this manually by editing your theme's Liquid templates, or use a tool like Thunder to automate it.
Thunder defers non-critical JavaScript, reduces render-blocking resources, and intelligently manages script execution — automatically, with one click.
Free plan available · No code changes required
Not Sure What's Slowing Your Store?
Get a free speed analysis showing exactly which apps and scripts hurt your Core Web Vitals — with personalized fixes.
Free · Takes ~60 seconds · Report delivered to your inbox
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