How Much Does Website Speed Really Affect Conversion Rate?

Multiple independent studies across e-commerce and lead generation sites have shown conversion rate dropping measurably for every additional second of load time beyond roughly two seconds, particularly on mobile networks.

The drop-off isn't linear or uniform across all page types. Landing pages tied to paid traffic tend to be the most speed-sensitive, since that traffic has no existing brand trust to offset a slow first impression.

Image optimization is usually the single highest-impact fix, since unoptimized hero and product images are the most common cause of slow Largest Contentful Paint scores.

Beyond raw speed, perceived performance matters: showing content progressively, avoiding layout shift, and ensuring interactive elements respond immediately all contribute to a page feeling fast, even before every asset has finished loading.