Plugin enabled
Images right of the fold are not loaded. When scrolling left they are loaded when needed. Shift-reload to test again. Compare this to page where plugin is disabled or page with gazillion images.
$("img.lazy").lazyload({
    effect: "fadeIn"
}); 
      <img class="lazy" data-original="img/example.jpg" width="765" height="574">
 
       
       
       
       
      