Generally, it would be good to explain your statement a bit.
I would say this is not always true as good optimizing compilers can turn clean code (whatever exactly you mean by that) into very fast code.
But it definitely can be true in certain situations.
However, the question is: Does it matter? My first goal
Is always to have maintainable and understandable code. I optimize only when I need to. This might result in less readable code. But I only do it if there is a serious performance problem or the requirements are not met.
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Generally, it would be good to explain your statement a bit.
I would say this is not always true as good optimizing compilers can turn clean code (whatever exactly you mean by that) into very fast code.
But it definitely can be true in certain situations.
However, the question is: Does it matter? My first goal
Is always to have maintainable and understandable code. I optimize only when I need to. This might result in less readable code. But I only do it if there is a serious performance problem or the requirements are not met.