Inada Naoki <songofaca...@gmail.com> added the comment:

Read this file too.
http://git.savannah.gnu.org/cgit/coreutils.git/tree/src/ioblksize.h

coreutils choose 128KiB for *minimal* buffer size to reduce syscall overhead.
In case of shutil, we have Python interpreter overhead adding to syscall 
overhead.
Who has deeper insights than coreutils author?

I think 128KiB is the best, but I'm OK to 64KiB for conservative decision.

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