Most likely this has nothing to do with Slf4j but the contention is within Log4j library. Searching on that leads to many Log4j issues [1][2]. Most likely you have some slow appender configured like ConsoleAppender or SMTP appender
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Most likely this has nothing to do with Slf4j but the contention is within Log4j library. Searching on that leads to many Log4j issues [1] [2]. Most likely you have some slow appender configured like ConsoleAppender or SMTP appender
[1] https://bz.apache.org/bugzilla/show_bug.cgi?id=50213
[2] https://bz.apache.org/bugzilla/show_bug.cgi?id=50614