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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: /var/tmp on tmpfs
Date: Fri, 9 Feb 2018 00:32:22 +0200
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On 08/02/18 23:57, Rich Freeman wrote:
> On Thu, Feb 8, 2018 at 4:52 PM, gevisz <gevisz@gmail.com> wrote:
>>
>> However, it probably won't be sooner than
>> # emerge --update --deep --with-bdeps=y --newuse --backtrack=90 --ask
>> world --exclude chromium
>> fails because of the "--exclude chromium" part :), as I have already compiled
>> the recent vertion of chromium with /var/tmp/portage on the hard disk and
>> it took more than 24 hours on my old AMD Athlon X2 with j2 option. :(
>>
> 
> Honestly I doubt that tmpfs will make much difference since this is
> probably CPU-bound.

The lack of disk I/O improves the desktop while using it. Build times 
get slightly lower, but as you said, not enough as to be the main use. 
It's really about avoiding disk I/O. Another benefit is reducing 
fragmentation on the disk.