For performance and SEO optimization reasons, we see a number of our clients using various 'lazy loading' techniques for the images on their sites and a question we often get is how to lazy load the Photoslurp widgets as well.
The "lazy load" functionality delays the images loading until the user scrolls to the location in which it's been integrated. It allows a better bandwidth performance on image-heavy sites.
Here’s a GIF that explains lazy loading in the best possible way: