You might run into OS buffer flushing, journal writes etc. Have a look at these options. Will signifivantly improove overall performance, at least. Con: Will drop some availability features. But because disks are quite reliable, I do not consider this harmful. noatime,barrier=0,journal_async_commit,noauto_da_alloc,nobh,data=writeback,commit=10 -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Squid-performance-with-high-load-tp4659270p4659277.html Sent from the Squid - Users mailing list archive at Nabble.com.