We are experiencing a slow start up time on the first report request of the day, or when there have been no report requests for an unknown period of time. In SQL Reporting
I believe the solution is to add a ProcessTimeout key in the rsreportserver.config file. There is this key in this file from the default installation but it is commented out. I'm not sure if this is minutes or seconds, but I modifed it to 28800 and the process was still running first thing this morning after no activity for over 12 hours. The first report loaded in a few seconds.
The file is located in ~/program files/microsoft sql server/msrs10.mssqlserver/reporting services/reportserver
I also modified the 7200 in this file.