I am currently doing a small performance intensive project in C++, and my take is that C++ has been a good fit for this.
But you have to consciously decide at the start what set of features that you will use. And no more. Because C++ has multiple usable subsets. Find one. Stay within one. Avoid confusion. (Particularly if, like me, you're not a C++ programmer and don't wish to become one. Then you can have a clearly defined boundary of what needs to be learned for the project.)
I recommend anyone using C++ to do this exact thing. It's the sanest way to use it without driving yourself mad when something no longer works because X causes issues with Y.
But you have to consciously decide at the start what set of features that you will use. And no more. Because C++ has multiple usable subsets. Find one. Stay within one. Avoid confusion. (Particularly if, like me, you're not a C++ programmer and don't wish to become one. Then you can have a clearly defined boundary of what needs to be learned for the project.)