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kotlinlang

So I have prototyped the same application in both Kotlin and Java
(<https://github.com/GavinRay97/GraphQLCalcite>)

For some reason, the Kotlin version is significantly slower than the Java implementation
It's a latency sensitive application, in Kotlin the query execution pipeline takes about ~24ms for a depth-2, basic query

In Java, it's closer to 13ms. Are there any big no-no's to keep in mind? I've tried to even stay to using `for (x in y)` loops etc and mutable collections and whatnot.

Without digging into the source code, I'd say your best bet is to lok into Java/Kotlin performance profiling. e.g. <https://www.baeldung.com/java-profilers>

I'll run Async Profiler and dig through JFR recording then I suppose

Interesting — is there a specific class or function between the two where that was happening? I'm just curious.

Ah no it was entirely user fault, there was a minute difference in the business logic implementation in one method that led to an object being cached :sweat_smile:

Ah, well I'm glad you were able to figure it out. I think you were asking the right questions — even if it didn't end up being some strange compilation or bytecode discrepancy. :slightly_smiling_face: