You chose a scripting language as your example. The profiler would probably tell you to rewrite the entire app in Java, which can be tricky because although the

You chose a scripting language as your example. The profiler would probably tell you to rewrite the entire app in Java, which can be tricky because although the Groovy code uses the Java syntax, the semantics are often different. If you use a language for building systems, the profiler would probably tell you nothing needs rewriting.