Beside websocket and http, unix socket connection would be great addition for better performance when instances are on same machine. According to this data, Unix Domain Sockets (UDS) is 3x-6x faster https://stackoverflow.com/a/29436429/5210790 <img width="535" alt="Screenshot 2020-11-04 at 15 28 06" src="https://user-images.githubusercontent.com/3015990/98117396-58eef780-1eb2-11eb-9b78-6d0156a4a041.png">