Stop Saying Java is Slow

How goes the battle? Java 25 Performance: Faster Starts, Smarter Memory, Better GC Java 25 isn’t just another incremental release. It brings meaningful performance improvements that directly impact how fast your applications start, how much memory they consume, and how efficiently they manage garbage collection. Let’s break down what changed, and why it matters. 🚀 Faster Startup with the New AOT Cache One of the most exciting additions in Java 25 is the new Ahead-of-Time (AOT) cache. Traditionally, when a Java application starts, the Just-In-Time (JIT) compiler kicks in and begins optimizing code as it runs. While this leads to excellent long-term performance, it adds overhead during startup. Java 25 changes that. With the AOT cache (introduced through JEPs 483 and 514), you can perform a “training run” of your application. During this run, the JVM observes which classes and methods are actually used. It then generates an optimized cache specifically for that execution profile. Later,