That runtime doesn't make any sense. This script creates a 1,000,000 line CSV string and then parses it into JSON in 700ms with Bun, and this is doing both things the slow way, creating the string with a giant array map and join, and parsing with a giant split('\n') on newline and map.

https://gist.github.com/david-crespo/8fea68cb38ea89edceb161d...