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Developer Details How a Shopify Store's Mobile PageSpeed Score Rose From 34 to 96

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A full-stack Shopify developer describes a case study in which a client's production store raised its mobile PageSpeed Insights score from 34 to above 96 without removing essential features or tracking apps. The audit found failing Core Web Vitals, with slow Largest Contentful Paint, high Total Blocking Time, and layout shift, caused by render-blocking third-party scripts, unoptimized images, and leftover code from uninstalled apps. The fixes included deleting orphaned theme snippets, which removed 18 network requests and about 380 KB of JavaScript, and loading the hero banner eagerly with high fetch priority while lazy-loading below-the-fold content. Reserving aspect ratios for image containers and space for the announcement bar further reduced layout shift. The article notes that these changes cut Largest Contentful Paint from 5.8 seconds to 1.8 seconds and lowered Cumulative Layout Shift from 0.32 to 0.01.

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