> Improved speed of Git source control operations by using git.exe

Can someone elaborate on this, how was it implemented in previous versions?

In fact, the README at https://github.com/libgit2/libgit2 says:

  libgit2 is already very usable and is being used in production for many applications
  including the GitHub.com site, in Plastic SCM and also powering
  Microsoft's Visual Studio tools for Git.