* A. Use fewer drill-down characteristics in the initial view: This can improve the query performance by reducing the amount of data that needs to be transferred and displayed at the start of the query execution. The user can drill down to more details later if needed1.
* D. Use mandatory characteristic value variables: This can improve the query performance by restricting the data selection to a smaller set of values that are relevant for the user. The user can also change the variable values later if needed1.
* E. Use include functions in the restricted key figures: This can improve the query performance by avoiding unnecessary calculations and aggregations that are done when using exclude functions. Include functions are also more efficient than selections or restricted key figures when filtering data1.
Reference:
* 2 https://blogs.sap.com/2015/04/20/query-performance-optimisation-tips-in-bw-73/
* 1 https://blogs.sap.com/2022/02/02/query-performance-optimization-in-bw-few-tips/
* 3 https://help.sap.com/doc/00f68c2e08b941f081002fd3691d86a7/2022.12/en-us/0471d0ecea4e4677ba29d9ac1496c24c.html
* 4 https://blogs.sap.com/2021/06/02/sap-bw-4hana-performance-optimization-part-i/