TCP Server has terrible performance

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11

You probably need to configure gen_tcp here.

https://www.erlang.org/doc/apps/kernel/gen_tcp.html#listen/2

Specifically the backlog option, to allow more connections in the queue.

You may also want nodelay from here:

https://www.erlang.org/doc/apps/kernel/inet#setopts/2

{nodelay, Boolean} (TCP/IP sockets) - If Boolean == true, option TCP_NODELAY is turned on for the socket, which means that also small amounts of data are sent immediately.

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