https://docs.python.org/3.8/whatsnew/3.8.html#optimizations begins with:

shutil.copyfile(), shutil.copy(), shutil.copy2(), shutil.copytree() and shutil.move() use platform-specific “fast-copy” syscalls on Linux, macOS and Solaris in order to copy the file more efficiently. ... more explanation ... (Contributed by Giampaolo Rodola’ in bpo-25427.)

That's all correct, except bpo-25427 is about removing the pyvenv script; it should be referencing bpo-33671.