The campaign delivers, but nowhere near the volume anticipated.
1. Compare against the traffic preview
Campaign creation shows traffic volume previews and availability by GEO and source for your targeting. If actual delivery is far below what was previewed, something changed after launch. If the preview was also low, expectations were the problem — see Creating a campaign.
2. Bid competitiveness
Winning some auctions but not many usually means the bid is marginal. The recommended-bid hint shows the clearing level — see Zero-bid alerts and bid recommendations.
3. Frequency capping
A tight frequency cap limits how often each user can be reached and will cap total volume regardless of budget.
4. Pacing
Even pacing spreads budget across the day by design. If you want volume as fast as possible, that's a pacing choice, not a fault.
5. Narrow targeting
Several narrow layers combined can reduce inventory dramatically. Watch for the warnings shown when a selection significantly restricts traffic. See Targeting options available to your advertisers.
6. Blacklists
An accumulated blacklist can quietly remove a large share of available inventory. Review it — see Blacklists and placement controls.
7. Filtering
Check the good-vs-filtered quality bars. A source that's mostly filtered delivers little by design, which is the protection working. See Traffic quality reporting.