Lazy loading option
Lazy loading is a strategy to identify resources as non-blocking (non-critical) and load these only when needed.
By enabling the 'Lazy loading' option, the app waits for the products to be visible on the page to render the app widget. It can make the initial display of the web page faster when the number of products on collection pages is large or when the infinite scroll is used on that page.
The 'Lazy loading' option is enabled by default in the app preferences to improve store performance when the app widget is displayed on collection pages that have many products. However, if this option is not the best fit for your store, you can disable/enable it in the app's Advanced preferences.