We've got some data driven subscriptions running on SSRS. Sometimes they take an unusually long time to complete, if I check the activity on the server I find that things are relatively quite.
What I did notice is that in the ReportServer database on the Notification table there's a column called ProcessAfter. Sometimes this value is set about 15 minutes into the future, and the subscription only completes after the time stated in that column.
What is setting this value? Since this behaviour is relatively rare.
MCITP BI Developer - MCTS SQL Server (http://bichopsuey.wordpress.com/)