# Why is my Shopify store slow on mobile devices while desktop scores 80+? (Technical Case 3) | Expert Answer & Guide

> Mobile devices have lower CPU processing power and operate on throttled 4G/5G connections. Unoptimized JavaScript, excessive tracking pixels, and unco... Read the detailed technical breakdown and recommendations.

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Why is my Shopify store slow on mobile devices while desktop scores 80+? (Technical Case 3) | Expert Answer & Guide

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Why is my Shopify store slow on mobile devices while desktop scores 80+? (Technical Case 3)

Mobile devices have lower CPU processing power and operate on throttled 4G/5G connections. Unoptimized JavaScript, excessive tracking pixels, and uncompressed hero banners disproportionately choke mobile browsers.

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In-Depth Engineering Explanation

Desktop computers easily parse heavy JavaScript scripts in milliseconds. However, low-end and mid-range mobile devices experience severe CPU main-thread blocking when executing scripts from review apps, live chats, and heatmaps. Solving this requires script deferral, critical CSS inlining, and lazy-loading non-essential assets.

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