Internet slow

[kishore]

i have installed  pfsense 2.1

till now its working fine. for internet filtering purpose 2days back i installed squid2 squid guard. i configured squid guard. after i installed squid guard users are complaining that  internet is slow. even my local erp also became slow i.e when erp is used through browser  and i have attached my hardware info. is there any way to increasing the speed ?