Java Projects - Second Edition

Performance

The second reason for using a logging framework is performance. Although it is not good to optimize for performance before we profile the code (premature optimization), using a methodology that is 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 an 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 ...