Hello there We are trying to make our Spring-based web application faster - as part of that we profiled it using JProfiler. Surprisingly we found that a rather large amount of our CPU seems to be being used in logback packages: ch.qos.logback.classic - 21% ch.qos.logback.classic.spi - 13% ch.qos.logback.classic.turbo - 9% We don't actually do much logging - in this run we actually wrote nothing to the logs. (We were at INFO level and no errors or noteworthy events occurred) When we drill down into one particular method, Jprofiler insists that one of our methods is calling ch.qos.logback.classic.Logger.log, but this method does not do any logging and the class does not reference logging at all. Any ideas what we are doing wrong? cheers Pez