Swift is a native language that compiles into native apps! So are C and C++. C (and C++) is inevitably the fastest language because it is so close to machine code (leaving Assembler aside). Many scripting languages directly plug into C for this reason. Node.js, PHP, and Python often directly utilize C functions, and those will always be very fast. Naturally, a pure C server will be the fastest server you could develop.
So, why not write our servers in C, you might ask? The reason you don't necessarily want to do that is that C is not convenient or safe in terms of memory leaks. It is complicated (some say impossible) to write good memory-safe programs in C. For web projects, this problem leads to the creation of Go (sometimes ...
