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ParparVM Reaches HotSpot Parity After Major AOT Performance Overhaul

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Codename One's ParparVM, an ahead-of-time VM that compiles Java bytecode to C for iOS and other platforms, has been brought from 4.21x slower than OpenJDK 25 to near-parity in a ten-benchmark suite via PR #5327. Six of the ten benchmarks now match or beat warmed HotSpot performance, a result achieved through hand-tuned C code, a new page-based heap, and improved code generation. Every optimization was verified against bit-identical output checksums compared to HotSpot, ensuring correctness was never compromised for speed. The team also ran 63 test pipelines covering maps, string builders, threads, and garbage collection stress tests before shipping the changes. Developers are advised to pin to a previous versioned release if any instability is observed following the update.

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