Is there any difference in speed of copying files from one location to another betwen python or delphi or c++ ? 
I guess that all 3 laguages uses same or similar win api calls and that there is not much performance difference.
Pythons shutil module does not use the Windows API, but instead uses an open/read/write loop. This may or may not be slower than using CopyFile(Ex). Please measure it, everything else is just guessing.
python file copying