Inserting std::strings in to a std::map?

To answer your supplementary question slightly. Try changing the map temporarily to a vector of strings, and then time it inserting a fixed string value into the vector For example.

As far as I can see in your example you only want to store an index as key value that is, as I suppose, simply incremented for each insertion. You could accomplish this with an std::vectorwhich is know to be the fastest container. Just use push_backand access the value with at(index).

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