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A more numeric reason for targeted optimization.

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Titus Winters 2016-02-17 10:57:02 -05:00
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@ -9945,7 +9945,13 @@ Optimizing a non-performance-critical part of a program has no effect on system
##### Note ##### Note
If your program spends most of its time waiting for the web or for a human, optimization of in-memory computation is probably useless. If your program spends most of its time waiting for the web or for a human, optimization of in-memory computation is probably useless.
???
Put another way: If your program spends 4% of its processing time doing
computation A and 40% of its time doing computation B, a 50% improvement on A is
only as impactful as a 5% improvement on B. (If you don't even know how much
time is spent on A or B, see <a href="#Rper-reason">PER.1</a> and <a
href="#Rper-Knuth">PER.2</a>.)
### <a name="Rper-simple"></a>PER.4: Don't assume that complicated code is necessarily faster than simple code ### <a name="Rper-simple"></a>PER.4: Don't assume that complicated code is necessarily faster than simple code