From owner-freebsd-questions@freebsd.org  Tue Jun 30 13:47:41 2015
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Date: Tue, 30 Jun 2015 07:47:36 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Quartz <quartz@sneakertech.com>
cc: FreeBSD questions <freebsd-questions@freebsd.org>
Subject: Re: Can't install freebsd inside virtualbox, glacially slow
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On Tue, 30 Jun 2015, Quartz wrote:

>
>> I can't seem to get the 10.1 installer to work under virtualbox,
>> everything is so slow it's completely unusable. The dvd image takes
>> upwards of a minute to even draw the opening ascii menu, and attempting
>> to boot the kernel just sits there forever. If I convert the memstick
>> img into a vdi and boot from that, I just get the "spinning slash"
>> forever (it doesn't even get to the menu). I've tried the 'set
>> vfs.unmapped_buf_allowed=0' trick, tried changing vb's chipset from
>> PIIX3 to ICH9, tried changing the number of CPUs and ram and everything,
>> but no dice. Anyone have any ideas?
>
> Nevermind, it's fixed. The virtualbox I was using claimed it was still the 
> most recent version, but manually checking virtualbox.org revealed that this 
> was a lie. Updating mostly fixed the slowness issue (It's still not as fast 
> as my other guest OSs, but it's at least it's usable now).

Make sure virtualbox-ose-kmod has been rebuilt after the host OS has 
been updated.