[fwsgonzo]

Writing performant code is a highly complex and arduous task that is highly dependent on compiler, language, system, hardware and actual needs.

It's also about understand the black box that is your program by using tools beside the programming language to understand memory usage, allocation patterns, blocking operations and dead-time, bloat, destructive interference in multiprocessing applications, NUMA-stuff and so on, and so forth. Then there's program-specific things like SIMD-processing, using efficient algorithms, differences created between standard-library implementations.

So, which language is faster is just a chapter in a book about performance. And, comparing two languages it feels like comparing apples to oranges. If you had the chance to go back and write a program over again, you will probably end up with an overall different, hopefully better, design.