All:
Load all images in the slider after the page initially loads, ensuring no delays between slide content when switching between slides.
Best for sliders with advanced navigation such as thumbnails, bullets and tabs.
Smart:
Load images from the very first slide after the page initially loads, and also preload images from neighboring slides. For example, when the slider first loads, the 2nd slide will be preloaded in anticipation of the slider changing. And then once the 2nd slide is viewed, the 3rd slide would then be preloaded, and so on.
A great option for sliders that only contain basic navigation, where progression is always “next” or “previous”.
Single:
Always load slide content “on demand”. Meaning only the first slide will be initially loaded, and subsequent slides will only be loaded when it’s their turn to be shown in the slider.
No Lazy Loading:
All content will be loaded when the page first loads. Often ok for sliders with minimal content. Not recommended for sliders with lots of slides and/or content.