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Shopify fix guide

Significant Unused JavaScript on Shopify

A large portion of downloaded JavaScript is never executed during page load. This wastes bandwidth and increases parse/compile time.

Issue ID: CWV-UNUSED-JS-001Severity: moderateEffort: M

Why this matters

A large portion of downloaded JavaScript is never executed during page load. This wastes bandwidth and increases parse/compile time. This affects load speed, Core Web Vitals, and how many visitors stay long enough to convert.

Shopify fix path

How to fix this on Shopify

Use theme settings, page settings, or theme code.

  1. 1Find the source of the issue in Shopify admin.
  2. 2Apply the change.
  3. 3Preview and publish.

After you fix it

  • Check Coverage tab in DevTools and confirm unused JS is reduced

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