The following canned reports are known to time out or run very slowly when sifting large database.
ITMS 8.x
The security scoping process in the SQL behind the reports is not optimized. They use inline select statements instead of a more efficient JOIN.
On recent versions these reports should be optimized with current tables and indexes. In case you still percive slowness on any of the mentioned reports above:
Extract the zip file attached to this article to a local folder
When your refresh the console the “Revised Reports” folder should be empty. Go ahead and delete it.