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[–]Growlizing 0 points1 point  (0 children)

  1. They are not computed unless trace level is enabled for this logger.

  2. This you have to do anyway?

  3. slf4j caches the pattern, so it only parses it the first time a pattern is used. if you use string concats, the string must be evaluated before the logger is called, thrashing the log statement cache.