Check Your Shopify Store Speed
Run a free Lighthouse audit on your Shopify store and get a complete JSON performance report. Feed it to ChatGPT or Claude to get specific, actionable fixes for your Core Web Vitals.
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Loading...Common performance issues on Shopify sites
These are the issues most frequently found in Shopify Lighthouse audits. Your report will tell you exactly which ones apply to your site.
Render-blocking third-party scripts
Shopify stores often load analytics, review widgets, and chat tools that block page rendering. These are typically the #1 cause of poor LCP on Shopify.
Unoptimized product images
Large product images without proper dimensions, lazy loading, or WebP conversion are a major source of slow LCP on Shopify stores.
Unused JavaScript from installed apps
Every Shopify app you install can add JavaScript to every page, even when it's only needed on specific pages. This inflates Total Blocking Time (TBT).
Large Liquid template rendering
Complex Liquid templates with many nested sections can slow server response time, leading to a slow TTFB that delays everything else.
Pro tip: Shopify's CDN handles image delivery, but you still control image dimensions and format in your theme. Make sure product images have explicit width and height attributes to prevent layout shift (CLS).
Want a detailed tutorial? Read our step-by-step performance fix guide →
Frequently asked questions
How do I check my Shopify store speed?
Enter your Shopify store URL at speedexporter.com and run a free Lighthouse audit. The report shows your Core Web Vitals scores, identifies render-blocking app scripts with exact byte sizes, and includes estimated fix times — no account required for the first two checks.
What is the biggest cause of slow LCP on Shopify?
The most common cause is render-blocking third-party app scripts (analytics, chat, review widgets) that load before the hero image. The Lighthouse render-blocking-resources audit lists each script with its size and estimated savings. Unoptimized product images are the second most common cause.
How do I pass Core Web Vitals on Shopify?
Focus on three areas: (1) Defer or remove app scripts you do not use on every page. (2) Use the Shopify image_url filter with format: webp and set explicit width and height on images to prevent CLS. (3) Add a preload hint for your hero image in your theme layout.liquid. Export the full JSON from PageSpeed Exporter and paste it into ChatGPT or Claude for theme-specific code changes.