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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Mon, 12 Oct 2015 07:01:05 -0700
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Comments: In reply to Sebastian Gniazdowski <sgniazdowski@gmail.com>
        "Re: Slowdown around 5.0.5-dev-0" (Oct 12, 10:21am)
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To: zsh-workers@zsh.org
Subject: Re: Slowdown around 5.0.5-dev-0
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On Oct 12, 10:21am, Sebastian Gniazdowski wrote:
}
} With both patches zprof running time is around 1806. RES is 152M and
} goes down nicely to 37564 when I quit the script. Didn't observe
} after-while slow down. The tool is almost fully usable for 89k
} elements (there's still a bit lag), however searching is slow,

If you configure --enable-zsh-heap-debug you can edit mem.c to set a
value for the heap_debug_verbosity variable which will cause a LOT of
debugging messages to be printed to stderr.  This may tell you where
it's spending time.

Shell variables are always passed around internally by value rather
than by reference, so operations on a big list will copy it a lot.