Everyone agrees that optimization work must start with objective measurement. . Meh. I always start with "Stop doing stupid stuff!" Because, most of the time, you can easily find big mistakes with relatively little observation and measurement.
Premature optimization is the root of all evil - luckily, no true Scotsman ever engages in it. Seriously, I don't know what's worse - this tautology, or the fact that it's so often discussed as if it means something
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(After that, the "low hanging fruit," it makes sense to use more rigorous methods.)
End of conversation
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