bug#66288: 29.1; Performance regression using pipe for subprocess

[Gerd Möllmann]

Dmitry Gutov <dmitry@gutov.dev> writes:

> On 02/10/2023 22:12, Gerd Möllmann wrote:
>> Chris Hanson<cph@chris-hanson.org>  writes:
>> FWIW, I can't reproduce the slowdown on macOS.  I get the
>> 
>>> ;process time: 0 (0 RUN + 0 GC); real time: 1
>> on the emacs-29 branch with emacs-29.1 and HEAD (same on master).
>
> Curious: I reproduced it once (master, an older session), but then not
> anymore, all subsequent attempts look fine/instant.
>
> That's with MIT Scheme 11.2, though (the output is a little different,
> chiefly the list of bindings at the top).

I've been using 12.1.  Was that macOS?