Turning on lazy loading the safe way

Turning on lazy loading the safe way

Lazy loading means an ad's auction only runs when the visitor scrolls near it, saving speed and unseen requests.

The steps:
— 1. Pick your below-the-fold slots first — never the ad people see instantly.
— 2. Set the trigger distance to about one screen-height before the slot.
— 3. Confirm the auction fires only on scroll, in the Network tab.
— 4. Watch your 'viewability' (how often ads are actually seen) — it should rise.
— 5. Check revenue didn't fall; if it did, widen the trigger distance.

Lazy-loading your top banner is a classic mistake — it delays the ad everyone sees.

In plain English: only lazy-load the ads below the fold, fire them just before they're seen, then watch viewability climb.