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Ideally arrays of primitive values like `long` to store the bytecode represenation for proper good performance. Then use bitwise manipulation to access "fields"

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At this point, why not just use C or C++ since you are already writing it like that? Gets rid of the whole middleman.

Because you get all the nice tooling around the JVM + safety of running inside the JVM.

See https://medium.com/@jadsarmo/why-we-chose-java-for-our-high-... / https://news.ycombinator.com/item?id=24895395

> An improvement can be discussed in the morning, and be implemented, tested and released in production in the afternoon.

That's what we did. Still no luck.

What are the bottlenecks according to the profiler?

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