Java 9 Programming By Example

Performance

The second reason to use a logging framework is performance. Although it is not good to optimize for performance before we profile the code (premature optimization), using some methodology known to be slow and inserting several lines into our performance-critical code, invoking slow methods is not really professional either. Using a well-established, highly optimized framework in a way that is industry best practice should not be questionable.

Using System.out.println sends the message to a stream and returns only when the IO operation is done. Using real logging handles the information to the logger and lets the logger do the logging asynchronously, and it does not wait for completion. It is really a drawback that log information ...