Theme Performance

10 Direct Code Changes to Make Shopify Dawn Theme Load Under 1 Second

By Muhammad Bilal Shakeel (Goofy Developer)2026-08-15T04:15:00Z7 min read

Out of the box, Shopify Dawn is lightweight, but after adding Google Tag Manager, Klaviyo, and product carousels, mobile PageSpeed drops below 50. Here are the 3 biggest wins:

1. Preload the Hero Banner Image (LCP)

Add preload="true" and fetchpriority="high" to your first section image tag inside image-banner.liquid.

2. Defer Global.js

Ensure global.js is loaded with defer="defer" to prevent render-blocking on mobile devices.

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Bilal (Goofy Developer) builds custom Shopify stores, GoHighLevel automation pipelines, and Meta ad campaigns focused on more sales.