Translation issues

When translating your C/C++/Java mindset, or directly porting a project to Rust, you might find yourself writing similar code to what you wrote in your native language, but if you have tried it, you might have noticed that it performs poorly, or at least much worse than your old code. This happens, especially with C/C++, since in the case of Java the performance issue is much lower compared to the high memory and computation footprint of a Java application, with its Java Virtual Machine and its garbage collector.

But why does a direct translation hurt the performance? We will see in this section how Rust's guarantees can sometimes create unnecessary boilerplate instructions, and we will learn how to bypass them by using safe and efficient code. Of course, in some performance-critical situations, unsafe scopes might be needed, but in general, that's not the case.