Performance Considerations
Speed Test, as the name implies was designed to allows testers to enter test cases as quickly as possible; however, performance can degrade over time if the system is not properly maintained. As the contents of the database grows, queries can take longer. It is important to remove information that is no longer used to keep the database as small as possible.
Deleting Releases
Releases are the main containers for all test plans, suites, cases, results, attachments and assignments. Deleting a release will free all of these child items. Any releases for which reports are no longer needed should be deleted to keep the database size to a minimum.