Free Shopify Speed Test

Your store is losing sales
to slow load times.

Run a free Shopify speed test in 30 seconds — powered by Google Lighthouse. Get your Core Web Vitals, detect app bloat, and find exactly what's dragging down your score. No account needed.

No account needed ·Shopify stores only ·Results in ~30 seconds

2,400+
stores diagnosed
53%
of shoppers leave if load > 3s
avg 4.2
bloat apps per store
How it works

Three steps. Thirty seconds.

1

Paste your URL

Enter your myshopify.com store address. No login or install required.

2

We diagnose

Google Lighthouse + app script detection runs against your live storefront in real time.

3

Get your report

Speed score, Core Web Vitals, and top issues explained in plain merchant language.

What we measure

Google's Core Web Vitals — explained for merchants

Google uses these five metrics to rank your store in search results and determine how fast it feels to shoppers. Store Speed Doctor measures all of them using the same Lighthouse engine Google uses.

LCP

Largest Contentful Paint

How fast your main product image or hero content loads. Directly affects whether shoppers see your offer before they bounce.

Good: under 2.5s
INP

Interaction to Next Paint

How quickly your page responds to clicks, taps, and keyboard input. Replaced FID as a Core Web Vital in March 2024.

Good: under 200ms
CLS

Cumulative Layout Shift

How much page elements jump around unexpectedly while loading. High CLS causes accidental clicks and a frustrating shopping experience.

Good: under 0.1
FCP

First Contentful Paint

When the first piece of text or image appears on screen. A fast FCP signals that your server and CDN are responding quickly.

Good: under 1.8s
TTFB

Time to First Byte

How fast your server starts sending a response. Slow TTFB is usually a hosting, CDN, or Liquid rendering problem.

Good: under 800ms
What you get free

Real data. No signup required.

Free preview
  • ✓ Overall speed grade (A–F)
  • ✓ LCP, INP, CLS, FCP, TTFB in plain English
  • ✓ Top 3 performance issues
  • ✓ App script count + total JS weight
  • ✓ Shareable results link
⚡ Full app (install free)
  • ✓ All 20 prioritized fixes with instructions
  • ✓ Which apps are causing slowdown
  • ✓ Orphaned script finder
  • ✓ Historical score tracking
  • ✓ Weekly auto-scans + email alerts
Pricing

Free to diagnose. Pay to fix.

Free
$0
Full diagnosis, unlimited scans
  • ✓ Speed grade (A–F)
  • ✓ Core Web Vitals
  • ✓ All issues visible
  • ✓ Unlimited scans
Starter Popular
$9/mo
Fix instructions + script detection
  • ✓ Step-by-step fix instructions
  • ✓ App script bloat detector
  • ✓ Orphaned script finder
  • ✓ Scan history (30 days)
Pro
$29/mo
Automated monitoring
  • ✓ Everything in Starter
  • ✓ Weekly auto-scans
  • ✓ Email regression alerts
  • ✓ Mobile + Desktop compare
FAQ

Common questions

Does this work with any Shopify store?
Yes — paste any public Shopify storefront URL ending in myshopify.com. The tool verifies it's a Shopify store before scanning.
Is the free test accurate?
Yes. It uses the same Google Lighthouse data as the paid app — we just show you a preview of the full results. The score and Core Web Vitals are real.
Why do you need my email for a second scan?
To prevent abuse of the Google PageSpeed API and to send you your report. One email only — no drip sequences.
Can I share my results with my developer?
Yes — every scan gets a shareable link (storespeed.doctor/scan/abc123) you can forward to your dev team or agency.
What is a good Shopify speed score?
A score of 90 or above (grade A) is excellent. 75–89 (grade B) is good with room to improve. Below 50 (grade D or F) means your store is likely losing conversions due to slow load times. Most Shopify stores with many apps score between 40–70.
How do I improve my Shopify Core Web Vitals?
The biggest wins typically come from: removing unused or redundant apps (each adds JavaScript that slows load time), enabling lazy loading for images, using a fast Shopify theme, and reducing the number of third-party scripts. Store Speed Doctor identifies exactly which issues to fix first, ranked by impact.
Does Shopify app bloat really slow down my store?
Yes, significantly. Each Shopify app you install can inject JavaScript, CSS, and tracking pixels that load on every page. Our data shows the average Shopify store has 4+ app scripts running simultaneously. Even apps you've uninstalled can leave orphaned scripts behind. Store Speed Doctor detects and measures the exact JS weight from each app.
Is Google Lighthouse the same as Shopify's built-in speed score?
No. Shopify's Online Store Speed report uses Lighthouse data from the Chrome User Experience Report (CrUX), which shows real-world averages over 28 days. Store Speed Doctor runs a fresh Lighthouse lab test on demand against your live store, giving you instant results that reflect your current state — including changes made today.
I already have a free speed app installed, but my Lighthouse score hasn't changed. Why?
Preloading apps improve perceived speed for repeat visitors by prefetching pages on hover — but they don't change your actual Google PageSpeed or Lighthouse score. Those scores measure render-blocking scripts, oversized images, and unused code. Store Speed Doctor shows you exactly what's keeping your score low.
Does Store Speed Doctor modify my theme or inject scripts into my store?
No — Store Speed Doctor is read-only. It runs Lighthouse audits against your live store URL and reads script tags via the Shopify API. It never modifies your theme files, injects JavaScript, or changes anything on your storefront.

Ready to fix your store's speed?

Install the full app on Shopify — free to start, no credit card required.

Add to Shopify — Free →
Built by Web Pioneers·Privacy Policy·Terms of Service