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• 00:59, 22 November 2025 PC talk contribs created page Java 23 vs. Rust on the Hot Path: Where GC Still Wins (Created page with "500px We chased sub-millisecond p99. Rust beat Java — until we changed how we allocate.
A single tweak to object lifetimes put Java back in the lead and shaved 18% CPU.
On the hot path, the garbage collector wasn’t the villain. It was the secret weapon. The Hot Path That Started the Fight A request fan-out: parse 2–4 KB JSON, hit three caches, stitch a 1 KB response. At 420k req/s on 32 cores, Java 23’s p99 hovered at 5.2 ms;...")