In every single one of these cases, it begs the question whether "JS" is the problem or "backwards compatibility". There are a huge number of inefficiencies that can be fixed with a full rewrite.
There was a recent conversation over ViteJS (a pure JS bundler) vs rust-based tooling, and when you dig into the numbers the real difference is SWC vs Babel. It raises the question whether a new transpiler written in JS can be competitive with Rust, but it's unclear if anyone tried.
There was a recent conversation over ViteJS (a pure JS bundler) vs rust-based tooling, and when you dig into the numbers the real difference is SWC vs Babel. It raises the question whether a new transpiler written in JS can be competitive with Rust, but it's unclear if anyone tried.