True or False: It is most efficient to keep data elements outside of a flow loop.

Keeping data elements outside of a flow loop is indeed the most efficient practice in Salesforce Flow design. When you place data elements inside a loop, the flow processes each item within the loop individually, which can significantly increase the number of operations performed. This can lead to performance issues, unnecessary complexity, and potential governor limit violations in Salesforce.

By keeping data elements outside of the loop, you can fetch or manipulate data before entering the loop and reduce the number of times you hit the database or perform calculations. This strategy not only enhances performance but also makes the flow easier to read and maintain. Therefore, the statement is true, as focusing on efficiency and resource management is essential when designing automations in Salesforce.