Wow we have had some different experiences. Going down your list, the only thing that has been a problem for me is the ecosystem issues, and that comes with the

Wow we have had some different experiences. Going down your list, the only thing that has been a problem for me is the ecosystem issues, and that comes with the territory with smaller languages. The most surprising was your issues with speed, which I feel like had to have been a compiler or standard library bug of some sort. I use Nim on a side project with moderate calculations, and it finishes in about the time it takes nodejs to do Hello World. I think most of your list comes down to preference though. Nim isn't a fully FP, immutable language. It supports FP more than Python though, and probably as much as JavaScript does.