Need for speed!

When comparing C++ with other popular languages (Python, Java, C#, etc.), it comes clear that adequately written programs on C++ almost surely will be faster than the analogous programs on the other languages.

But ever C++ is divisible by speed.

1. In standard projects it’s common to use classes like std::shared_ptr instead of raw pointers, to have a lot of memory allocations, to forget using std::move, etc.
2. It a-bit-non-standard projects (browsers, compilers) things are getting tougher - there is small vector (a vector on the stack), static polymorphism (using CRTP instead of virtual methods), std::string_view pointing to somewhere instead of std::string. This isn’t unusual for most programmers.
3. But real-time programming is another world. It’s forbidden to make syscalls, to block threads, to use algorithms slower than $O(1)$, and so on. This is needed for processing signals and sound, HFT systems…

There is a nice talk about the third disivion by Timur Doumler:

This talk was very interesting for me, as I had not so much experience in real-time systems.