Why does Scala seem to be slow at benchmark results?

• benchmarks

  40 2,741 7.2 Makefile

  Some benchmarks of different languages

Nowadays, I reached out for some benchmark results. Scala is slower than Java and Kotlin. Can you explain it? https://github.com/losvedir/transit-lang-cmp https://github.com/kostya/benchmarks

• transit-lang-cmp

  15 421 0.0 Elixir

  Programming language comparison by reimplementing the same transit data app

Nowadays, I reached out for some benchmark results. Scala is slower than Java and Kotlin. Can you explain it? https://github.com/losvedir/transit-lang-cmp https://github.com/kostya/benchmarks

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• grpc_bench

  58 850 8.4 Dockerfile

  Various gRPC benchmarks

There are gRPC benchmarks, for example, where difference between Scala and Java is either negligible or Scala is "better": https://github.com/LesnyRumcajs/grpc_bench/discussions/284

• µPickle

  4 693 6.7 Scala

  uPickle: a simple, fast, dependency-free JSON & Binary (MessagePack) serialization library for Scala

  

The upickle library has traditionally had great performance for handling json in Scala apps so is likely to be seen as a safe choice for someone starting a Scala project. It appears though that not just upickle, but other json library projects are having difficulties maintaining their old level of performance when they release using Scala 3's macros. uPickle currently has an open issue where you can see some of these issues: https://github.com/com-lihaoyi/upickle/issues/389 and here you can see the weePickle folks are also having the same performance problems. Looks like things changed up significantly enough between Scala 2 and Scala 3 so that in order to maintain the same functionality they have resorted to using runtime reflection for mapping to/from case classes.

• jsoniter-scala

  29 706 9.6 Scala

  Scala macros for compile-time generation of safe and ultra-fast JSON codecs

You can use jsoniter-scala. It is easy to use like upickle.

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