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Seconded. Well worth a read and I've learned some new things, too.
Let me join here. It was an interesting article, worth reading, and worth thinking about it (as the following comments show). I never thought that I would read something about optimization for speed - today, when computers have more and more power and nobody really seems to care for any kind of optimization, when "bloatware" is everywhere, making the most modern computer react as it was already 10 years old. Optimization is considered to be "outdated" by many "modern" programmers, I sometimes think. But it's basics. You should know about complexity classes, iterations (if you have to do them), memory consumption and COW. Thanks for putting such an article on OSNews.