You can't. It's hosted on a single machine and most of the code is single-threaded. It's maintained by a small group of people with limited time and resources,

You can't. It's hosted on a single machine and most of the code is single-threaded. It's maintained by a small group of people with limited time and resources, and as far as I know there is no way to get access to the codebase. HN is funded by Y-Combinator, who I'm certain would be happy to take your money but I'm not confident it would get put towards improving this site.