Change the delivery speed of a line item
DFP's ad delivery pacing system is designed to distribute the impressions for a line item in one of three ways:
As fast as possible: A line item is never considered "on schedule" and tries to use every impression it can get.
Frontloaded: A line item begins by briefly serving to a goal that is as much as 40% higher than a goal without frontloading, and then gradually declines to serving 5% ahead of schedule as the campaign draws to its end. The sum of impressions during the first half of the campaign can be as much as 25% higher than without frontloading.
Even delivery The ad server will deliver 5% more than the even goal. However, due to forecasting hints, the delivery indicator may be higher than 105% particularly early on in a campaign. (learn more about forecasting hints to the ad server)
It can be helpful to think of "as fast as possible" line items as "deliver fast, if possible" line items. In other words, if there is enough inventory, they should deliver fast, but we're not going to preempt delivery of "evenly" scheduled line items at the same priority.
DFP still computes a satisfaction index (SI) for "as fast as possible" line items; the goal SI for all line items (evenly, frontloaded and as fast as possible) is the same. During the line item selection process, "as fast as possible", "evenly", and "frontloaded" line items are weighted based on whether or not they're behind schedule.
So, if an "as fast as possible" line item is the only eligible candidate, it will always serve (until it hits its impression goal) but if there are competing line items, they will compete based on which line item is more behind schedule to hit its impression goal by the end of its run.
For both frontloaded and even delivery line items, DFP distributes the total number of impressions over the life of the campaign. DFP distributes the impressions by calculating hourly delivery goals for the line item based on:
- the number of impressions booked
- number of impressions already served
- time remaining in the campaign
- traffic hints from the forecasting system
- a frontloading factor
The only difference between frontloaded and even delivery is the frontloading factor that is applied to each hourly goal. The goals for frontloaded ads are increased by 25%, while the goals for even delivery ads are increased by only 5%. For even delivery ads we still apply this small 5% frontloading factor as an extra safeguard against underdelivery.
To change the delivery speed of a line item:
Click the Delivery tab.
Click the order containing the line item you'd like to edit.
Click the line item you'd like to edit and then click the Settings tab.
Under "Deliver impressions", select either of the following:
As fast as possible
By default, DFP will deliver ads evenly across the line item's delivery period.