[atfzl]

Vite uses esbuild for transpiling and rollup for bundling. esbuild (written in go) is already pretty fast for transpiling but there might be a lot of possibilities to optimize in rollup as rollup is written in JavaScript.

[FractalHQ]

Coincidentally, the primary maintainer of Rollup mentioned plans for a rust rewrite in his recent talk at Vite Conf.