Benchmark

To execute

mvn clean compile -P logback exec:java -DLOG_LEVEL=INFO -DAPPENDER=STDOUT
mvn clean compile -P logback exec:java -DLOG_LEVEL=DEBUG -DAPPENDER=STDOUT
mvn clean compile -P logback exec:java -DLOG_LEVEL=INFO -DAPPENDER=FILE
mvn clean compile -P logback exec:java -DLOG_LEVEL=DEBUG -DAPPENDER=FILE

mvn clean compile -P log4j exec:java -DLOG_LEVEL=info -DAPPENDER=stdout
mvn clean compile -P log4j exec:java -DLOG_LEVEL=debug -DAPPENDER=stdout
mvn clean compile -P log4j exec:java -DLOG_LEVEL=info -DAPPENDER=file
mvn clean compile -P log4j exec:java -DLOG_LEVEL=debug -DAPPENDER=file

Logback

Level	Appender	Time	op/μs
DEBUG	STDOUT	28055ms	28,055
INFO	STDOUT	14ms	0,014
DEBUG	FILE	4976ms	4,976
INFO	FILE	17ms	0,017
DEBUG	ASYNC	N/A	N/A
INFO	ASYNC	N/A	N/A

Log4j

Level	Appender	Time	op/μs
DEBUG	STDOUT	30593ms	30,593
INFO	STDOUT	16ms	0,016
DEBUG	FILE	5137ms	5,123
INFO	FILE	20ms	0,020