How page speed quietly kills e-commerce conversions

Nobody abandons a cart because of a number in a Google report. They abandon it because the product photo took four seconds to appear, the page jumped just as they tapped "buy", or the checkout froze long enough to trigger that little voice that says "is this site legit?". Speed problems don't read as technical problems to shoppers — they read as trust problems.

What Core Web Vitals actually measure

Google's three metrics map to those exact feelings. Largest Contentful Paint asks: how long until the main content is visible? Interaction to Next Paint asks: when the user taps, does the page respond? Cumulative Layout Shift asks: does the page hold still, or does content jump around while loading? They matter twice — once because they influence rankings, and again because they describe the experience of every visitor you already paid to acquire.

Where store speed actually goes to die

In practice, most slow stores share the same culprits: oversized images shipped at full resolution, a graveyard of tracking scripts and apps installed over the years and never removed, themes that load everything on every page, and fonts blocking render. The purchase path is usually worst of all — the checkout accumulates "just one more" pixel and plugin until it's the heaviest page in the store, at precisely the moment users are most impatient.

Fix in order of revenue impact

Start where money changes hands and work backwards: strip the checkout to essential scripts only, compress and lazy-load images, then audit third-party tags quarterly and delete anything you can't name a reason for. A store that loads in under two seconds doesn't just rank better — it feels like a store you'd give your card number to. That feeling is the conversion.