来自于一篇大神的论文，而且原意没有一句话那么简单。
Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.
In established engineering disciplines a 12 % improvement, easily obtained,
is never considered marginal.
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