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Lazyload
The Prebid auction can be split per placement, based on how the user scrolls on the page and when the placement will become in-view.
There are 2 options to implement lazyloading on your pages.
The most optimised
(100% of control on your side)
You call Hubvisor via a callback when it’s time to run the auction for the lazyloaded placements.
The most simple
(via GAM)
Prebid auctions are run at page load but will be sent to the adserver only when the placement is about to become in-view.
Disadvantage: as the Prebid auction is done at page load, there are chances that the winning bid will never be sent to the adserver as the placement will not be viewed by the user.
It can have a negative impact on the performances.