It sounds like you found how to change the Test List Type
Performance configuration settings are stored on a per test basis, so currently there is no way to apply the same configuration to every test in the list. We are discussing this feature for a future release, however.
We do not
recommend including every test in your project in a Performance Test List. Please review the section on what constitutes a valid candidate in our Performance Testing
Please also see blogs posts on the topic by our Evangelist Jim Holmes:
the Telerik team
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Telerik Public Issue Tracking
system and vote to affect the priority of the items