pfSense » pfSense Packages

https://forum.netgate.com/topic/153877/squid-and-squidguard-on-pfsense-for-large-deployment/2:

Hi, I have 150 proxy users in my network, running on old dual core E5200 & 3GB RAM. CPU usage is avg 5%, RAM 20%, so your HW should 
handle it.

But Squidquard is weak point, by default it set url_rewrite_children 16 startup=8 idle=4 inside Squid advanced options. It's not 
enough for my users (not enought "processes"), so had to modify it like url_rewrite_children 128 startup=64 idle=32. But ANY time I 
set something inside Squidquard and press Apply, then default is back and have to set it again... You will probably need to set 
higher values (not sure what is max) to handle 600 users.

This is currently hardcoded:

define('REDIRECTOR_PROCESS_COUNT', '16 startup=8 idle=4 concurrency=0');