The relationship between page speed and conversion rates
Studies by Akamai and Google demonstrate that a 100-millisecond delay in website load time can hurt conversion rates by up to 7%. In online retail, product imagery accounts for the vast majority of transmitted bandwidth.
By compressing catalog photos and converting to WebP, e-commerce storefronts cut page weight by 50% to 70%, leading to higher mobile checkout completion rates.
Best practices for product galleries and zoom
Standardize product photography on consistent aspect ratios (e.g. 1:1 square or 4:5 vertical) and maximum resolutions of 1600x1600px to support crisp high-DPI zoom while keeping file sizes strictly under 250 KB.