I think you're underestimating the effort needed for parallelization here. Deno is written in a language that was built for "fearless concurrency" (Rust), where

I think you're underestimating the effort needed for parallelization here. Deno is written in a language that was built for "fearless concurrency" (Rust), whereas Bun is written in a language that barely has a concurrency story (Zig)