Premature optimisation is the root of all evil.
Async I/O is an optimisation.
85 List of unlinked pages on Stack Exchange sites jan 26 '11
37 Ignoring somebody screws up the avatar list nov 11 '12
31 Enlarge the clickable area of closing reasons jul 4 '13
25 Should I report a serious security issue on meta? sep 15 '09
19 Chat shouldn't highlight commas that come after mentions if they are not part of the user's name feb 23 '12
18 Does this mister really work for Stack Exchange? feb 15 '14