I doubt typescript is faster than babel with all the static analysis it does. In fact it's typical for projects to use typescript as a check in CI and actually build with babel, for speed. Fast alternatives to babel are things like esbuild and swc

Typechecks are optional, just use transpile-only mode for the build: it merely removes the type annotations, it's fast.

You can have the best of both worlds: Intellisense based on types in the editor yet fast transpile in the build.