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Date: Tue, 28 Jul 2015 02:07:31 -0700
From: Marcus Reid <marcus@blazingdot.com>
To: Matthias Apitz <guru@unixarea.de>, Slawa Olhovchenkov <slw@zxy.spb.ru>,
 freebsd-current@freebsd.org
Subject: Re: duration of buildworld
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References: <20150727055804.GA2312@c720-r276659>
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On Mon, Jul 27, 2015 at 08:47:04PM +0200, Matthias Apitz wrote:
> This pointed in the right direction. I have had 6x 1 GByte additional
> swap partitions to plain files mounted

Swap devices are used in an interleaved fashion. By having multiple
file-backed swap devices on (presumably) the same disk, you are
multiplying the disk thrashing that happens when you swap.  This could
slow things down quite a bit.

Marcus