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The biggest one for me is the preprocessor. The preprocessor is THE reason C++ has such horrendous compilation times compared to basically any other language.

Others have mentioned uniform initialization, which I definitely agree with.

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I believe templates make for slower compilation times.

These are one and the same issue. Templates have to be in headers and cannot be in source. The preprocessor requires that headers be repeatedly reparsed and recompiled. So, templates get repeatedly recompiled.

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