Performance
Lazy loading ads: speed and revenue on the same side
Lazy loading slots — loading the ad only as the reader approaches it — cuts initial page weight, improves LCP and raises viewability: the slot that loads near the screen is the slot that gets seen.
The classic mistake is the double opposite: loading everything on page load (slow page, invisible impressions) or loading too late (empty slot on screen, lost revenue). The fine-tuning is per position and per the real audience's scroll speed.
Alongside it comes space reservation: a slot with reserved height doesn't push content, and CLS thanks you. The two techniques together are most of the difference between monetization that fights the site and monetization that lives with it.
Our tags are born this way: async, with calibrated lazy loading and reserved space — measured before and after, in PageSpeed and field data.
Sources and reading
web.dev · Google Publisher Tag