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In the case that your app isn't CPU-bound, which is many cases.

[EDIT: Changed most to many. But I think arguments about whether or not speed matters are silly in the general case. Arguments about tradeoffs are always going to be so specific to your app that a general argument is fairly meaningless.]

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Most cases for whom? There are plenty of fields in which being cpu-bound is the norm rather than the exception. There are a whole load of assumptions that go into any general advice like this, consider making fewer of them today!

That's like objecting to the statement "Most people have two arms, two legs and one head" by replying "For whom? There are plenty of demographics, such as amputees, where having a different number of arms or legs is the norm!" The fact that unusual things are normal for some subset defined by those characteristics is tautological. It doesn't make the general statement false.

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