[softwaredoug]

My knowledge is like 10 years old - For a long time, Microsoft's stl implementation was based on their licensning of dinkumware's STL (https://www.dinkumware.com/). Not something maintained in house. It seemed to work OK'ish - giving lowest common denominator functionality. However, it was pretty easy to create higher performing specialized data structures for your use case then what seemed like simple uses of dinkumware STL.

[garaetjjte]

malloc is not related to STL. But about it, big issue with Microsoft STL is that it is atrociously slow on debug builds.