Rust High Performance

Cyclomatic complexity

Another possible bottleneck is the cyclomatic complexity of functions. While not directly related to the translation of code from other languages, it's true that Rust can sometimes increase the cyclomatic complexity of the code, since it forces you to check for optional (nullable) results, some complex iterators, functional programming, and so on. This is great for code security, but sometimes the compiler has issues properly optimizing the code we write.

The only way to avoid this is to separate the code into smaller code units that will help the compiler optimize better unit by unit. One way of doing that is by creating smaller functions, with no more than 20–25 branches each. A branch is a place where, depending on ...