A very powerful method to identify performance bottlenecks is performance profiling. Visual Studio (including the free-of-cost Community edition) offers convenient tools for that via the Debug>Performance Profiler... menu entry.

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Analyze the performance of a Git command specified as a command-line

1. Open the "git.exe" file via File>Open
2. Specify the arguments and the working directory via Debug>git Properties
3. Debug>Performance Profiler...

Analyze executables compiled by GCC

Visual Studio obtains the debug information used in the output from ".pdb" files, but GCC does not generate debug information in that format.

However, the debug information can be extracted from the ".exe" files and be written out as ".pdb" file via the "cv2pdb" utility.