Imagine how much less compute capacity we would need if Ruby and Python were as fast as .net core.

We're talking a lot about doing something for the environment, it could start with using "fast enough" languages.

Of course we need to find a compromise between performances and ease of use. So I wouldn't abandon .net core for Ruby or Python, but I would for something as performant (or better ofc) but friendlier to use.

In that case, the elephant in the room is of course Javascript ;) It can be up to 50x faster than python or ruby.

A single RDS instance and a handful of web servers can handle hundreds of millions to low billions of requests a month with last byte responses under 200-300ms.