STINNER Victor added the comment:

While I hope that users of the -u options expect the slow-down, would it be 
possible to benchmark it?

For example, try to write setup.py content character by character to stdout 
using -u or not, into a TTY, into a pipe and/or a file. I'm curious if the line 
buffering vs really unbuffered has a significant impact on performances.

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<http://bugs.python.org/issue30404>
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