[erlang-questions] About Erlang system performance

[Richard O'Keefe]

> 
> Most significant systems are speed limited due to I/O and networking: the CPU usage can be surprisingly low. Erlang handles async and simultaneous I/O and networking extremely well - by design.

I recently had a program where each run took 3 hours.
Of that, about 2 minutes was CPU time (in C).
The thing that needed to be optimised was disc seeks,
not CPU instructions.

Systems and benchmarks can be very different.