Performance
Shopify speed audit: what actually slows a store down
Shopify hosts your store on fast infrastructure, so slow Shopify stores are almost always slow because of what has been added to them: apps, images, fonts and third-party scripts.
Want to see which of these issues your own store has? The scan is free.
Scan my store freeMeasure the right pages
Test a product page and a collection page, not just the homepage. Use field data where available, because lab tests on a fast connection hide the problems your mobile buyers experience.
The usual culprits, in order
- Apps injecting scripts on every template, including ones you uninstalled.
- Hero and product images served far larger than their display size.
- Multiple font families and weights loaded render-blocking.
- Sliders and popups that shift layout after load, destroying CLS.
- Chat widgets and analytics loaded synchronously in the head.
What to do
- Remove leftover script tags from uninstalled apps.
- Serve responsive image sizes and lazy-load below-the-fold media.
- Reserve dimensions for images and embeds so nothing jumps.
- Preconnect to required third-party origins and defer everything non-critical.
- Limit to two font weights and use font-display: swap.
Speed alongside the rest of the audit
StoreFix detects this class of issue during the audit, applies the safe repair through the Shopify Admin API, stores the previous value so you can undo it, and re-runs the audit to confirm the fix landed.
Frequently asked questions
- Is the Shopify speed score the same as Lighthouse?
- Shopify's admin score is a Lighthouse-based average across sampled pages. Use Lighthouse or PageSpeed Insights directly for actionable detail.
Find these problems in your store. Fix them in one click.
StoreFix scans your Shopify store, repairs everything it can safely change, and runs the audit again to verify the result.
Scan my store freeNo login needed for the audit.