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It's safe to assume that people complaining about a language's performance deal with CPU bound cases.

Not in my experience. I've seen countless cases where people just assume they have a CPU bound bottleneck, but profiling reveals that it is actually IO bound.

And that's ignoring all the cases where people rewrite their code in a new language to get a 10 time performance boost, ignoring the fact that a better choice of algorithm and data structure would give them a 100 time performance boost.

This is false:

benchamarksgame doesn't come even close to cover what I'd consider "most cases" of programs written.

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