IME, if you want a fast hash map, the very first thing you should do is ignore anything that uses closed addressing. If you really d I need one of the extra gua

IME, if you want a fast hash map, the very first thing you should do is ignore anything that uses closed addressing. If you really d I need one of the extra guarantees provided by std::unordered_map, see if you can’t get it by using a container of unique_ptr<T> or shared_ptr<T> instead of unordered_map<T>.