Why is my Rust program slower than the equivalent Java program?

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Have you tried running Cargo with --release?

When you build without optimisations, it will often be slower than it would be in Java. But build it with optimisations (rustc -O or cargo --release) and it should be very much faster. If the standard version of it still ends up slower, it’s something that should be examined carefully to figure out where the slowness is—perhaps something is being inlined that shouldn’t be, or not that should be, or perhaps some optimisation that was expected is not occurring.

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