Shopify handles a lot of performance basics automatically — most remaining speed problems come from what's been added on top of the platform.
Shopify apps are easy to install and easy to forget about. Each active app adds its own script load, and stores accumulate apps over time far more than they remove them — a common, often unrecognised source of slowdown.
Product photos uploaded at full resolution, without compression, are one of the most common and most fixable causes of slow Shopify stores — particularly costly given how image-heavy most product and collection pages are.
Extensive custom code added on top of a theme, especially by multiple developers over time without cleanup, can accumulate redundant or conflicting scripts that meaningfully slow page rendering.
An app installed for a specific campaign or one-time need often stays active indefinitely afterward. A periodic review — removing what's no longer actively used — prevents gradual, invisible speed degradation.
Analytics, ad pixels, and marketing tool scripts each add measurable load time, particularly when several are running simultaneously. Auditing which are genuinely necessary versus which have simply accumulated is often worth the same attention as app cleanup.
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