Swift is competing with a good number of frameworks and languages. Some might argue that performance is only one out of many factors that should be considered when choosing a technology. While that is undoubtedly true, think of this: you want to build a project in a way where technology will not hold you back much. Facebook, as well as Uber, has spent years rebuilding and reworking their infrastructure. No matter what technology you choose, you will most likely refactor your application as well. However, having selected a stack that allows you to do so gracefully is crucial.
You could be looking at some raw benchmarks in this section, but I think it makes more sense to analyze with a bit more depth what performance holistically looks like for a project. When comparing Swift to its competition, you want to stay as clean and objective as possible; the following...