It’s been almost six months since we released Log4j 2.5, and we have a bunch of neat things added since then. The biggest change is that now you can operate Log4j in a garbage-free mode during steady state logging. Sounds a bit jargony? The basic idea here is that once your application is initialized and doing its thing (the steady state), logging no longer contributes towards memory pressure, thus you have more control over memory allocation and gargabe collection. Various Java performance gurus point out that logging tends to add a lot of overhead to applications, and one major reason is due to garbage generated by the logging framework. The less garbage objects generated by the framework, the less time your application needs to spend collecting said garbage.