do you have refresh_all_ims on in tour squid.conf ?? put it off and try reload_into_ims off as well -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Sudden-but-sustained-high-bandwidth-usage-tp4676366p4676664.html Sent from the Squid - Users mailing list archive at Nabble.com.