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I’m incredibly confused why profiling wasn’t even mentioned in this post.

I would highly recommend anyone troubleshooting something like this to do continuous profiling and the root cause of this type of problem becomes painfully obvious within seconds.

(Disclaimer I founded a company in this space, and we recently open sources a library for rust to do this: https://www.polarsignals.com/blog/posts/2023/12/20/rust-memo...)

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Profiling will catch many of these types of errors, but not all of them. Although I do think a profiler is indeed probably the first thing you should be reaching for, especially in Java, which has some of the best profiling in any language.

Right, but judging by the detail of the post, and not mentioning profiling makes it seem like it wasn’t even attempted.

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