he's using io.Copy in the main websocket handler, which is a generic, buffered routine for manipulating byte buffers. I don't know if the other implementations are buffered in this manner. It's likely that there are ways to improve the Go source.

Erlang is significantly more established, but I'm wary of judging technologies on their technological merits alone. Although the technical merits of Erlang are very interesting, I've been quite happy with my experiences using Go.