Ceki finally fixed some of the performance problems in the FileAppender. See https://logback.qos.ch/news.html <https://logback.qos.ch/news.html> and https://docs.google.com/spreadsheets/d/1cpb5D7qnyye4W0RTlHUnXedYK98catNZytYIu5D91m0/edit#gid=0 <https://docs.google.com/spreadsheets/d/1cpb5D7qnyye4W0RTlHUnXedYK98catNZytYIu5D91m0/edit#gid=0>. I suspect we have a few optimizations we can make.
Ralph