While reading some articles about the iPhone 4 antenna challenges, i found an interesting article about the best moments of a consultants life. It looks to be the same in any technical area, for example in the RF business:
Sometimes, you win the game by making base hits and hustling in the outfield. You fight for every inch. But, sometimes, just occasionally, with the bases loaded and the wind blowing in the right direction... you get 30 dB in 30 minutes.
It's pretty much the same in performance tuning on computer systems: Sometimes you fight for every millisecond, for a few percents less interrupts, and then there are days where you half the response time in 10 minutes. Most of the times it's because someone didn't knew about something basic, because it isn't her or his daily job.

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