See also [https://forum.nim-lang.org/t/4253](https://forum.nim-lang.org/t/4253) / [https://github.com/drujensen/fib](https://github.com/drujensen/fib) where Nim C++ was 8 times faster than C, Nim C or C++.
Single-threaded Fibonacci is a benchmark of tail-call optimizations and tail-call folding. Multithreaded Fibonacci is a benchmark for runtime overhead.
