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<https://gist.github.com/tateisu/be6cdaee0a4e28186090fb3834899788> A quick speed comparison for `apply {…}`. Why three times slower ?

That's not it because the lambda for apply is inlined. <@U8PRY47UY> Can you try a JMH run?

You're not taking into account jvm warmup.

There was almost no difference in the measurement using JMH.
```Benchmark       Mode  Cnt          Score         Error  Units
Test1.usePutA  thrpt    5  198647812.122 ± 5274224.588  ops/s
Test1.usePutB  thrpt    5  199240159.796 ± 3084180.600  ops/s```

<https://github.com/tateisu/BenchmarkInlineFunction>

Surprising indeed. Maybe the extra variables have something to do with it. Can you try replacing the value with an actual HashMap?

```Benchmark               Mode  Cnt          Score         Error  Units
Test1.Assign_usePutA   thrpt    5  203400407.487 ± 2865226.203  ops/s
Test1.Assign_usePutB   thrpt    5  204155138.678 ± 3377144.700  ops/s
Test1.HashMap_usePutA  thrpt    5  178620434.808 ± 1841608.980  ops/s
Test1.HashMap_usePutB  thrpt    5  179397964.384 ± 2171024.588  ops/s```