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> C++ is at least still pretty committed to the you only pay for what you use principle. As far as I know RTTI is the only real exception (corrections welcome), but even RTTI can be disabled in many compilers.

Compile time would also be an exception.

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I had a program that had to parse a lot of integers like "12345". The std way to do it was an order of magnitude slower than writing my own simple parsing code. I have no idea what the std version was doing, but it was crazy to see my program's execution time (measured in hours) dominated by int parsing. The handwritten version eliminated that.

You didn't say which std function you were using that was slow. But std::from_chars performs a lot faster than std::stoi et al due to many reasons.

Yeah I don't remember what I originally used. It might have been stoi but it might have been iostream.

Even there, you can use a subset of C++ and get pretty good compile times. Worse than C, as you're still dragging around the full weight of a C++ compiler, but still.

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