Premature optimisation is the root of all evil.
Async I/O is an optimisation.
16 How can I use man without less? oct 27 '11
4 What does “WHIRLPOOL size ;-)” mean? may 18
3 For some IPs, ping -c 4 -W 1 ip | cat does not output anything until ping has finished, whereas it does for others jan 4