Reviewed October 13, 2026

Does lazy loading images really speed up your Shopify store?

Yes, for images below the fold. Lazy loading defers offscreen images so the page can render sooner, but lazy loading your main hero or product image does the opposite and can wreck your largest contentful paint score.

What lazy loading changes

Without lazy loading, the browser tries to fetch every image on the page at once, competing for bandwidth with the styles and scripts needed to render anything at all. Lazy loading tells the browser to fetch images only as the shopper scrolls near them.

On a long collection page with forty product photos, that difference is large. On a short page with three images, it is minor. Context decides whether the technique matters.

The image you must never lazy load

Your largest visible image above the fold, usually the hero or the main product photo, should load eagerly and ideally be prioritized. If that image is lazy loaded, the browser waits, and your largest contentful paint time gets worse while the page looks slower to everyone.

Check your theme for a loading attribute on the first product image. Many speed complaints trace back to a theme that lazy loads everything without exception.

Which images should be lazy

Product grid images below the first row, related product photos, blog images further down the page, and footer or testimonial images are all good candidates. They cost bandwidth early and benefit nobody until the shopper scrolls.

Native lazy loading with the loading attribute is enough for most stores. Heavy JavaScript lazy load libraries can cost more speed than they save on a modern theme.

How to verify it is working

Load a collection page with network throttling in your browser tools and watch images appear as you scroll, rather than all at once. Then check your speed report and see whether the main image is flagged as lazy loaded or as the largest contentful paint element.

Real shopper data matters more than a single lab test. Watch the trend over a week after a change instead of reacting to one score.

Common lazy loading mistakes

Lazy loading images inside hidden tabs or accordions can cause blank flashes when they open, lazy loading above the fold logos delays branding, and forgetting width and height attributes causes layout shift even when timing improves.

Speed work is a package: right images deferred, main image prioritized, dimensions reserved. Fix those three and most image related speed warnings quiet down.

Frequently asked questions

Does Shopify lazy load images automatically?

Many modern themes do for product grids and sections below the fold, but settings vary. Check your theme code or use browser tools to confirm what your store actually does.

Can lazy loading hurt my speed score?

Yes, if it is applied to the main above the fold image. That delays the largest element on the page and can make your largest contentful paint score worse.

Should I use an app for lazy loading?

Usually no. Native browser lazy loading built into themes covers most cases, and an extra app adds script weight that can cancel the benefit.

What is layout shift and why do image dimensions matter?

Layout shift is the page jumping as images load. Setting width and height on images reserves their space, so content stays still while images arrive.