I was going through this project over the weekend. And while I can't recall where exactly in the docs I read this, I am quite sure the author mentioned that there are various python projects but they are quite slow. Other implementations such as leela chess zero have a lot of C++ and are difficult to follow.

In fact, one of the things we want to do is maximize the performance of the Julia implementation. We hope to co-develop the compiler and ML stack to address these issues as they come up.