The era of islands is over for most development scenarios. You don’t have to make one definitive choice. Instead, you get to hog all the productivity you can for the common cases, then outsource the bottlenecks to existing packages in faster languages or build your own tiny extension when it’s needed.
…So please don’t let bottlenecks (real or imaginary, usually the latter) dictate your choice of software development environment. We have a term for that and it’s called premature optimization.