When you create a new process you can't share things like network connections. Also, IPC tends to be very slow. It is abstracted away nicely in python, but it's

When you create a new process you can't share things like network connections. Also, IPC tends to be very slow. It is abstracted away nicely in python, but it's still very slow, making some parallelism opportunities impossible to exploit. For creating stateless, mostly IO bound, servers, it's great. Try to squeeze in performance and it all starts to fall apart.