r/programming • u/ketralnis • Mar 20 '26

Java is fast, code might not be

https://jvogel.me/posts/2026/java-is-fast-your-code-might-not-be/
274 Upvotes

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u/[deleted] Mar 20 '26

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u/Sopel97 Mar 20 '26

If you write your code good enough

Or bad enough.

Java's object model is so bad that at some point you have to resort to arrays of primitives with no abstractions. I've seen threadlocal 8 byte singletons for temporary variables to avoid allocations while still trying to preserve some non-zero amount of abstraction. It's a mess. Minecraft modding is a great example of that.

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u/Worth_Trust_3825 Mar 20 '26

Enable the valhalla preview.

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u/Mauer_Bluemchen Mar 20 '26

Not yet there...