A conference talk from Jfokus 2026 covering 13 concrete performance improvements in JDK 25 compared to JDK 21, spanning standard libraries, the JIT compiler, and garbage collectors. The presentation explores design tradeoffs behind these optimizations and how JDK engineers evaluate real-world performance. It also highlights the new preview feature Stable Value, which allows a field to combine benefits of both mutable and immutable data for potential speedups in existing applications.
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