Sometimes your app works, but you want to increase performance by boosting its throughput or reducing latency. Other times, you just want to know how code behaves at runtime, determine where the hot spots are, or figure out how a framework operates under the hood.
Some of these details can be provided at design time, as IntelliJ IDEA provides you with all sorts of clues that can be produced statically. Of course, you cannot learn about all the bugs and inefficiencies by just looking at the code, because things get more complicated at runtime. Verifying any guesses you have can prove to be a to
