Fill rate below 92%? Recover it step by step

Fill rate below 92%? Recover it step by step
Fill rate = % of ad requests that returned a paid ad. Healthy programmatic fill is 95-99% (n=88 sites). Every unfilled request is a wasted pageview.

— Step 1: Split fill by geo — Tier-3 traffic naturally fills lower, don't panic.
— Step 2: Add a backfill/house chain for unsold inventory.
— Step 3: Check if a high floor is rejecting bids (lower 15%, retest).
— Step 4: Confirm passback tags fire on no-bid.
— Step 5: Add one more demand partner for thin geos only.

So what: 90% → 97% fill on US traffic adds ▲ 7% RPM directly.