The new Pacing tab is a report designed to facilitate the management of many Line Items at once. From pacing to performance, this report summarizes all key metrics for each Line Item in your seat, making any potential issues easily identifiable at a glance. Check for a pulse on all your active campaigns, identify any issues with pixel placement, and assess pacing for all your Lines and Advertisers in one consolidated report. This report is updated each day at 6 am EST with metrics for the previous day.

Read more here: Pacing Report