Maybe you're confusing memory (RAM) vs storage ? Because I converted some backend processing services from nodejs to rust, and it's almost laughable how little RAM the rust counterparts used.
Just running a nodejs service took a couple of hundred mb of ram, iirc. While the rust services could run at below 10mb.
But I'm guessing that if you went the route of compiling an actual binary from the nodejs service, you could achieve some saving of ram & storage either way. With bun or deno ?
Use paru to install software :) search online for aur software-name, and then install with paru -S name-from-aur-website. Paru also has search, but I don't remember the syntax :)