Java 25 introduces Compact Object Headers (JEP 519), delivering up to 30% CPU savings and reduced memory usage for applications with small objects. This user-friendly feature compresses object headers

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Java 25 introduces Compact Object Headers through JEP 519, reducing object header size from 12 to 8 bytes and delivering up to 30% CPU savings with significant memory reductions. The feature requires only a JVM flag to enable and works transparently with existing code. Amazon has validated it across hundreds of production services, showing 22% less heap usage and 8% faster execution in benchmarks. The enhancement particularly benefits applications with many small objects, improving garbage collection performance and container density in cloud deployments.

Java 25 Integrates Compact Object Headers with JEP 519