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-rw-r--r--Lib/shutil.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/shutil.py b/Lib/shutil.py
index 9b50c2a983..7dd470dfab 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -49,7 +49,7 @@ if os.name == 'posix':
elif _WINDOWS:
import nt
-COPY_BUFSIZE = 1024 * 1024 if _WINDOWS else 16 * 1024
+COPY_BUFSIZE = 1024 * 1024 if _WINDOWS else 64 * 1024
_HAS_SENDFILE = posix and hasattr(os, "sendfile")
_HAS_FCOPYFILE = posix and hasattr(posix, "_fcopyfile") # macOS