No SMP is not enabled . I tried to change minimum configs to easier debugging . Forgot to say this graph is taken from squid SNMP CPU usage . I am using rock store for past 4~5 days but the CPU usage grows right after upgrading to new version . also the CPU usage is higher even several hours after squid start . everything in squid looks normal but CPU usage of squid is triple times more. -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/3x-cpu-usage-after-upgrade-3-1-20-to-3-3-8-tp4662906p4662929.html Sent from the Squid - Users mailing list archive at Nabble.com.