Uses jQuery.sonar to only load an image when it's visible in the viewport.
https://wordpress.org/plugins/lazy-load/
Widgets · WordPress Plugins
Get access to data on 216,758 websites that are Lazy Load for WordPress Customers. We know of 68,116 live websites using Lazy Load for WordPress and an additional 148,642 sites that used Lazy Load for WordPress historically and 33,119 websites in the United States.
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Get a list of 216,758 websites using Lazy Load for WordPress which includes location information, hosting data, contact details, 68,116 currently live websites and an additional 47,568 domains that redirect to sites in this list. 148,642 sites that used this technology previously and 33,119 websites in the United States currently using Lazy Load for WordPress.