Run a Core Web Vitals audit. Flag the worst offenders and suggest fixes.
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Run a Core Web Vitals audit on my store. Check LCP, CLS, INP across homepage, product pages, and collections. Flag the worst offenders and suggest fixes.
- Tests LCP, CLS, and INP across page templates.
- Identifies the specific assets / scripts causing issues.
- Drafts fixes (image preload, lazy-load, defer JS) for you to review.
- Recommends apps to uninstall if they're the bottleneck.
What you're trying to do
Slow pages lose impatient shoppers, and Core Web Vitals are one of Google's page experience signals. Most Shopify stores have a few fixes that make the biggest difference: preload the LCP image, defer non-critical JS, remove a heavy app. Fudge finds them and drafts the changes.
Things to watch out for
- Real user data: Fudge can integrate CrUX data alongside synthetic Lighthouse.
- App culprits: Fudge identifies apps that disproportionately impact CWV.
- Theme limits: some issues need a theme fix; Fudge writes them.
- Re-test: after fixes, run the audit again to confirm the improvement.
How Fudge does it
Fudge runs the audit on your live store without changing anything, and ranks what it finds by impact. Ask it to fix an item and it drafts the change in your theme for you to preview and publish.
Why Core Web Vitals matter for both Google and conversion
Core Web Vitals (LCP, CLS and INP) are part of Google’s page experience signals, and they measure what shoppers feel. Fast, stable pages lose fewer visitors. The audit identifies which pages on your store have the worst scores and ranks fixes by likely traffic and conversion impact.
When to run this audit
Run the Core Web Vitals audit if your store’s performance hasn’t been assessed lately, or after any significant theme changes (new app installs, theme migrations, image-heavy launches). Especially worth doing before high-traffic moments.
The audit reveals hidden problems — apps you forgot you installed adding scripts, image sizes that ballooned over time, layout shifts on mobile that desktop testing missed.
What makes a great audit
- LCP, CLS, INP across all page types — homepage, product, collection and cart pages.
- Mobile + desktop separately — most performance failures are mobile-specific.
- Worst-offending pages flagged — sorted by user impact, not by error count.
- Drafted fixes — for findings Fudge can fix in your theme, ready to preview.
- Field data + lab data — Lighthouse synthetic + real-world data from Chrome UX Report.
Common mistakes to avoid
The biggest mistake is optimizing for Lighthouse scores instead of real-user metrics. Lab tests miss real-world variability; field data tells the true story.
The second mistake is fixing without re-testing. Performance fixes can interact with each other in unexpected ways. Re-run the audit after each batch of fixes.
Pair this with SEO audit + fix list and mobile UX audit, three audits that together cover ranking, conversion, and user experience. Fudge runs this as part of its Shopify SEO work; for the manual steps, see how to speed up a Shopify theme.