Lazy Loading (Output) [Optional]
And integer value determines whether to perform lazy loading of images.
Eligible value can be 0, 1, 2 and so on. If the value is '2', it will load images of current slide and '2' adjacent slide.
If this option is not specified, it will not perform lazy loading.
If this option is specified, the generated image element looks like <img data-src2="image_url" ... />
See options - slider maker help