[ubuntu] Squid performance with flaky network

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http://ubuntuforums.org – (First time poster here and I've not found an answer after a bit of searching.) I was diagnosing a network problem on a customer's site yesterday. They use squid on ubuntu (11.x) and connect to the 'net via one of two ADSL lines. Connectivity to the main business site they used had slowed to an impossible crawl. But other sites (bbc, google) were working fine. That site works mostly ok if I hook my (XP) laptop directly to the ADSL router, taking maybe 10 seconds to load a page, but can take multiple minutes to load via squid/ubuntu. Turns out there was end to end packet loss, when the (Hardware)