Testing your application before shipping is an important part of the development process, and an important part of testing is making sure your application executes efficiently and responsively. That’s where code analysis and profiling tools and techniques come into play: They let you evaluate your code for errors, bottlenecks and efficient use of processing and memory resources. Modern code profiling tools can point you directly to the exact lines of code that need refactoring -- or to libraries and other dependencies that are weak points in your application architecture.