This is built on swc, and they compare themselves to vite, which is built on esbuild. So the answer to your question is that they claim to be roughly twice as fast as esbuild (-based bundlers) in the benchmark in this article.
The only bench I'm aware of was presented in November 2023: https://x.com/boshen_c/status/1719596594985681275?t=x8FaB9Aw..., where esbuild was faster.