A practical guide from the ManageShopify team.
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Leftover app code is the most common one. Every app you install adds scripts; uninstalling the app often leaves them behind, loading on every page for a store that no longer uses them. Next: images uploaded at print size and displayed at thumbnail size, themes carrying features for stores ten times your size, and scripts in the header that block the page from rendering until they finish.
Another speed app, usually. Apps that promise one-click speed add their own code to a store already suffering from too much code. Compressing images helps, but it cannot cancel out render-blocking scripts.
Measure first, so you know your real baseline. Remove dead app code. Fix render-blocking JavaScript and CSS. Optimize and lazy-load images. Then measure again and compare honestly. That is the whole method, and it is why our speed work ends with a before-and-after report.
If your theme has been edited by several developers, or you are afraid to touch it, that is the point where a measured cleanup pays for itself. Our speed service starts at $299 and begins with the same audit described above.
Send us your store link. We will show you the top issues affecting your speed, SEO and sales, and what each fix involves.