Lazy loading is a design pattern commonly used in computer programming to defer initialization of an object until the point at which it is needed. It can contribute to efficiency in the program's operation if properly and appropriately used. The opposite of lazy loading is eager loading. (Wiki)
Contao supported versions
Extension is supported for latest Contao 3 and Contao 4.
Lazyloading images with LazySizes.js without the disturbing reflow of the website, whenever an image is loaded.
Several options are available in the generic contao settings: