squid proxy slow internet

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http://www.linuxquestions.org – centos 6 server 64 bit running transparent proxy: squid-3.1.10-19.el6_4.x86_64 machine: sun x2100 M2 server the problem I have with this proxy machine is slowness. It goes nice and fast for a couple of days and then on the 3rd day or so of running the internet slows down to a snails pace. I've tried restarting squid but it made no difference. Google shows this to be a common problem and yet there's no clear solution I've found. I use snmp in cacti and watch the traffic on my whole network and there's no heavy usage anywhere. The x2100 server is a very fast machine with 8Gb ram so there sho (HowTos)