How to speed up slow zpool scrub?

[Miroslav Lachman]

DH wrote on 04/26/2016 17:47:
>> 5GB of RAM
>
> That seems to be an insufficient amount of system ram when employing zfs.
>
> Take a look at this:
>
> http://doc.freenas.org/9.3/freenas_intro.html#ram

I know 5GB is not much these days but is memory used for scrubbing a 
lot? Because I am satisfied with working performance. The only concern 
is slow scrubbing and I am not sure that more memory helps in this case.

Miroslav Lachman