Lazy load is an optimization technique used to display reviews. Instead of showing reviews immediately after your store fully loads, they will only be displayed when users scroll to the review section.
The Lazy Load option can be found on the Reviews widget settings page. Only Ryviu's paid plans allow you to turn off the Lazy Load option, which means reviews will appear on the product page after it has fully loaded, without requiring the user to scroll to the review section.
If you have any queries, please don't hesitate to ask.