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From: Helmut Karlowski <helmut DOT karlowski AT ish DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: Bash / cygwin process spawning (?) performance very slow
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Date: Wed, 23 Sep 2015 11:24:30 +0200
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litter AT null DOT net:
Wed, 23 Sep 2015 10:52:26 +0200
---------------------------------------------------
> Hi all,
> 
> I noticed that doing simple loops in Bash takes unexpectedly long under Cygwin on a Windows XP 32 bit machine 
> (CYGWIN_NT-5.1 <machine> 2.2.1(0.289/5/3) 2015-08-20 11:40 i686 Cygwin)
> 
> I already followed the FAQ advice in trying to determine general causes, and made a 'shadow' copy of /etc/passwd as described.
> My PATH does not contain references to network shares.
> 
> Still quite normal commands take a long time e.g. 
> time cat some-file | while read i;do echo $i;/bin/true;done
> 
> real 1m44.953s
> user 0m9.599s
> sys 1m36.865s

#wc t; time cat t  | while read i;do echo $i;/bin/true;done >/dev/null
 172  172 3448 t
    3.73s real     0.04s user     0.43s system

On cygwin 1.7.35 and XP32. Not THAT fast but similar to your 
linux-result. I guess your antivirus is interfering. I've configured 
my avast to not deep-scan anything in C:\cygwin\bin, maybe that helps.

-Helmut


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