How to Check Your Shopify Page Speed Issues

Shopify Discussion

Topic summary

Practical checklist to diagnose and improve a slow Shopify store, focusing on identifying causes and isolating issues.

Key steps:

  • Use Shopify’s Speed Report (Online Store → Themes → Speed) to see what’s impacting performance (apps, theme scripts).
  • Run Google PageSpeed Insights (PSI = Google’s performance audit). Review “Opportunities” and “Diagnostics” for large images, slow scripts, and render‑blocking resources (files that delay page rendering).
  • Audit apps and leftover code: disable apps one by one; check theme code for scripts left after uninstalling.
  • Optimize images: compress and prefer WebP to reduce file size.
  • Test a clean theme copy: duplicate the theme, disable apps, and compare speeds to confirm app-related slowdowns.
  • Review fonts and custom/external scripts: multiple font files and old custom code can add load time.

Next steps: share PSI score or URL for tailored pinpointing. No conflict or final resolution; guidance is open-ended.

Summarized with AI on December 11. AI used: gpt-5.
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If your Shopify store feels slow, here are the quickest ways to find what’s causing it:

1. Check Shopify’s Speed Report
Go to Online Store → Themes → Speed to see what’s affecting performance (apps, theme scripts, etc.).

2. Use PageSpeed Insights
Enter your URL in Google PSI. Look at “Opportunities” and “Diagnostics” for issues like large images, slow scripts, or render-blocking elements.

3. Review Apps & Leftover Code
Some apps add heavy scripts—even after uninstalling. Try disabling apps one by one or checking your theme code for leftovers.

4. Optimize Images
Compress large images and use WebP when possible. Oversized images are one of the biggest speed killers.

5. Test a Clean Theme Copy
Duplicate your theme, disable apps, then test again. If it’s faster, you know the slowdown is app-related.

6. Check Fonts & Custom Code
Multiple font files, old custom code, and external scripts can add extra load time.

Share your PSI score or URL and I can help pinpoint the biggest issues.