it won't be about learning C++ as there are already too many, but it will be more about optimization and performance, from low level code to design decisions.
Ideally the target won't be only experts, but also new programmers who want to learn how to write better code.
If you are writing about "optimization and performance, from low level code to design decisions" why limit yourself to C++? Won't most of what you have to say be language independent?
Ideally the target won't be only experts, but also new programmers who want to learn how to write better code.