Sorry once again I failed to provide the version numbers…
pfsense 2.2.6-RELEASE (amd64)
SG 1.9.18
squid3 0.4.7
The integrations field contains the following:
url_rewrite_program /usr/pbi/squidguard-amd64/bin/squidGuard -c /usr/pbi/squidguard-amd64/etc/squidGuard/squidGuard.conf;url_rewrite_bypass off;url_rewrite_children 16 startup=8 idle=4 concurrency=0
I am not knowledgeable enough with squid to know what this does, so if you spot anything shady, please let me know! At least, there is some references to squidguard..
I hope transparent proxy with squid works with 2.2.X otherwise whats the point of having the option to do so? Plus it worked (somehow and not stable) in older versions of pfsense.
Regarding the antivirus, pfsense runs on a dual core CPU at 3.2GHz with 12GB RAM… So far it doesnt seem to be hindering bandwidth but I'll try to disable it to see if its faster.