Myth: lazy-load every ad to boost viewability

Myth: lazy-load every ad to boost viewability

"Lazy-load everything" is the loudest advice in the niche. It quietly costs you money up top.

What it does — defers ad requests until the slot nears the viewport.
Setup effort — 1/5 with most plugins.
The correction — lazy-loading your above-the-fold unit adds request latency before the highest-value slot, so header bidding finishes after first paint and your top bid times out. Viewability goes up, but eager-loaded ATF usually wins on RPM.
RPM lift seen — eager ATF + lazy below = +6-9% vs lazy-all. Lazy-all only wins on very slow connections.
Pros — bandwidth savings, better CLS below fold.
Cons — fumbled ATF if you over-apply.

Lift: ★★★★☆ — Risk: ★★☆☆☆
Best for: long pages — lazy from slot 2 down. Skip lazy-all if your ATF unit is your top earner.