It is I/O bound, but Python 2 and 3 do I/O differently. From the same comment that you're referring to:
> Python 2 emits writes of 4096 bytes, and python 3... 8193 bytes (edit: not a typo, this is 8KiB + 1).
> Python 2 emits writes of 4096 bytes, and python 3... 8193 bytes (edit: not a typo, this is 8KiB + 1).
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