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Scala 3 slowed us down?

(kmaliszewski9.github.io)
261 points kmaliszewski | 1 comments | 07 Dec 25 15:08 UTC | HN request time: 0.264s | source
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jiehong ◴[07 Dec 25 18:17 UTC] No.46183745[source]▶
> After upgrading the library, performance and CPU characteristics on Scala 3 became indistinguishable from Scala 2.13.

Checking the bug mentioned, it was fixed in 2022.

So, I’m wondering how one would upgrade to scala 3, while keeping old version of libraries?

Keeping updated libraries is a good practice (even mandatory if you get audits like PCI-DSS).

That part puzzled me more than the rest.

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1. gavinray ◴[07 Dec 25 19:44 UTC] No.46184465[source]▶
If your Maven/Gradle/SBT build specifies a version constraint for a third party lib, updating your Scala or Kotlin version doesn't affect this

(For scala-specific libs, there is a bit more nuance, because lib versions contain scala version + lib version, e.g. foolib:2.12_1.0.2 where 2.12 = scala version)