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There is a common saying that Erlangs I/O layer is slow. Bullshit. The etorrent program can easily sustain 70 megabit with less than 5% of CPU usage on my old machines. The reason is that etorrent is shuffling 16k binary blocks around mostly. But that means you have a pointer to each 16k block and you are only a writev(2) call away from the disk.