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:func:`shutil.copytree` uses :func:`os.scandir` function and all copy
functions depending from it use cached :func:`os.stat` values. The speedup
for copying a directory with 8000 files is around +9% on Linux, +20% on
Windows and + 30% on a Windows SMB share. Also the number of :func:`os.stat`
syscalls is reduced by 38% making :func:`shutil.copytree` especially faster
on network filesystems.
(Contributed by Giampaolo Rodola' in :issue:`33695`.)
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