Two critical factors are directly linked to performance when you take an application as a black box:
- Memory usage: If too much memory is consumed, it can slow down the application or even make it dysfunctional
- CPU time: If an operation is too slow, it will consume a lot of CPU cycles and impact the overall performance
Without too much external tooling (except the Java Development Kit (JDK) and/or operating system tools), you can easily extract a lot of information and start working on the performance.
