（多选题）
A common approach to solve application performance issues is to add more hardware. Which two reasons describe why this alone does not always solve performance problems?（）
AThere may be a bottleneck in the application that additional hardware would not solve.
BAdding more hardware is costly and time consuming.
CAdding hardware at the application layer may place additional load on an already overloaded database, network appliance, or storage system.
DAdding more hardware may introduce new configuration requirements that need to be tested.
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