[ubuntu] squid3 slow

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http://ubuntuforums.org – Hi comrades, ave just installed squid3 on ubuntu12 server lts, running on transparent mode, my server specs are core 2 duo, 3.18, 4gb ram and 1tb hardisk. The server is too slow, i have 13 nodes connected, is there a way out of the low sever speed....? (Hardware)