Where should I add defer attribute in Shopify script for parallel fetching?

chrisinlondon
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This experiment adds a defer attribute to render-blocking scripts, causing the browser to fetch them in parallel while showing the page. Deferred scripts still execute in the order they are defined in source.

 

Example implementation: <script src="/cdn/shop/t/2/assets/crucial-commerce-page-speed.js?v=182156177923500543921693551231" defer></script>

 
ASSETS/INSTRUCTIONS:
/cdn/shop/t/2/assets/crucial-commerce-page-speed.js?v=182156177923500543921693551231
 
can someone tell me where i add the above code in my shopify theme for this to work
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