Lighthouse
Lighthouse on Shopify: performance, accessibility, SEO
Lighthouse scores a single page load across performance, accessibility, best practices and SEO. On Shopify it is most useful as a diagnostic on a real product page, run on mobile emulation.
Want to see which of these issues your own store has? The scan is free.
Scan my store freePerformance flags you can act on
- Eliminate render-blocking resources — defer app scripts and non-critical CSS.
- Properly size images — stop serving 2000px files into 600px slots.
- Largest Contentful Paint element is an image — preload the hero image.
- Avoid large layout shifts — reserve space for banners, badges and embeds.
- Reduce unused JavaScript — usually a direct measure of app bloat.
Accessibility flags
- Image elements do not have alt attributes.
- Form elements do not have associated labels — common in newsletter and search widgets.
- Background and foreground colours do not have sufficient contrast.
- Heading elements are not in a sequentially-descending order.
- Links do not have a discernible name — icon-only social links without aria-label.
The SEO category
Lighthouse's SEO checks are deliberately shallow: title, meta description, crawlability, legible font sizes, valid hreflang. Passing them is a floor, not a strategy — but failing them on a product template is a genuine problem.
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
- Why does my Lighthouse score change between runs?
- Lab tests vary with network and CPU conditions. Compare medians across several runs and prioritise field data from real users.
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.