Slow image load handling about jquery.lazy HOT 1 CLOSED

That sounds more like wrong usage to me. Its unlikely that you have 3000 images in your viewport. But Lazy only handles the images in viewport. It sounds to me like your images don't have an initial size. Therefore the default size of your images is 0x0px. So on page load ALL your images fit in the viewport of the browser, so every image will be loaded at once what of course is not great. But I never had problems with large pages / galleries if the images had correct dimensions.

from jquery.lazy.