IDEA Original idea is here - https://github.com/MicroUtils/kotlin-logging The idea is to pass Supplier<String> to debug (info, error, etc.) methods instead of template string and object varargs array. KOTLIN (just for example) In kotlin it looks like that: logger.debug { "Some $expensive message!" } So you pass just function and framework decides evaluate for message producing it or not. JAVA in java it may looks like that: logger.debug(() -> "Code which produce heavy log message")); or logger.debug(() -> { return "Code which produce heavy log message" })); E.g. we put isDebugEnabled call into framework and make code cleaner. IMPLEMENTATION It is necessary to add counterpart method with Supplier<String> argument for all methods that have final String s, final Object... objects arguments in signature. DISADVANATAGES For now I can see only one - slf4j framework will require java 8 version Do you agree to add such feature? Feel free to ask any me any questions.