There is also Pixi from the same developer group (http://prefix.dev). It still uses the Conda ecosystem but it provides a Nix shell-esque environment as well as lock files. It basically maximizes the reproducibility of a development environment without the need for containers. No need for crazy remoting plugins in your IDE, or devcontainers. Pixi is also written in Rust so it should be at a similar performance as Mamba.