(Not your link but) some pointers on tuning erlang/OTP servers:

http://www.erlang-consulting.com/thesis/tcp_optimisation/tcp...

http://www.trapexit.org/Building_a_Non-blocking_TCP_server_u...

http://groups.google.com/group/erlang-programming/browse_thr...

(this erl mailing list thread is pretty typical, if you put up code, describe your app, hardware, network, database/external dependencies, etc, you'll get a ton of good advice about killing off bottlenecks. Another example

http://groups.google.com/group/erlang-programming/browse_frm...