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If the CPU usage of my code jumped by a massive percentage, and only 20% of it can be attributed to one problem, I'm certainly going to pay attention to it. But I'm going to pay a lot more attention to the problems causing the other 80%.

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Not if the 20% was the single largest individual process sucking up power.

And whose solution was simple (even if not immediately easy to achieve).

[Edit for focus: And whose solution was obvious.]

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