Check 2 / 12 MED impact In the full checklist
Lazy load below fold images + videos + reviews
What this check is
Below-the-fold media competes with the hero for bandwidth. Loading it on approach keeps the first screen fast while everything still appears as the shopper scrolls.
How to implement it
Set native lazy loading and explicit dimensions on images below the fold, defer video loading until it enters the viewport, and load the review widget only when its container approaches the viewport. Never lazy-load the hero image or the first product image.
How to verify it
Load the product page with throttled network and watch the request list: no below-fold image or video request should fire before scrolling, and no layout shift should occur as they load.
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