Product Images and Conversion Rates
Amazon found that every 100ms of added load time cost them 1% of revenue. Walmart reported a 2% increase in conversions for every 1 second of load time improvement. Product images are the heaviest assets on product pages.
A WooCommerce product page with 6 gallery images at 500 KB each loads 3 MB of image data. Compressed to WebP at 100 KB each: 600 KB. That is 2.4 MB saved per page view. On mobile, this translates to 2–3 seconds faster load time.
