Benchmarking the https://youtrack.jetbrains.com/issue/KT-27481

Bench.kt

package jmh

import org.openjdk.jmh.annotations.*
import org.openjdk.jmh.infra.Blackhole

@State(Scope.Benchmark)
@Fork(1)
open class KotlinLazy {

    @State(Scope.Thread)
    open class LazyHashcodeState {
        val value = LazyHash(
                "ddbba5d9-1477-4c2e-81d4-1a33d5377f05",
                "f69105f7-96d8-49d6-8b0e-6d3e2e096ee0",
                "f356f4ed-efb4-4176-aeb7-9dcad1d80e2a",
                149544948149544948
        )
    }

    @State(Scope.Thread)
    open class EagerHashcodeState {
        val value = DataHash(
                "68882523-a257-4177-a32b-bb1c23404eed",
                "43a3f0b0-af33-4aa4-a8d6-f5f621e46749",
                "24785ba0-5efc-4684-a2e7-9592bec2fa12",
                122046460122046460
        )
    }

    @Benchmark
    fun lazyHash(bh: Blackhole, state: LazyHashcodeState): Int {
        return state.value.hashCode()
    }

    @Benchmark
    fun eagerHash(bh: Blackhole, state: EagerHashcodeState): Int {
        return state.value.hashCode()
    }
}

data class DataHash(val uuid1: String, val uuid2: String, var uuid3:String, val id: Long)

class LazyHash(val uuid1: String, val uuid2: String, var uuid3:String, val id: Long) {

    private var memoizedHashCode = 0
    private var memoized = false

    override fun hashCode(): Int {
        return if(memoized) {
            31 * memoizedHashCode + uuid3.hashCode()
        } else {
            var result = uuid1.hashCode()
            result = 31 * result + uuid2.hashCode()
            result = 31 * result + id.hashCode()
            31 * result.also { memoized = true; memoizedHashCode = it } + uuid3.hashCode()
        }
    }
}

outputs.txt

#### Synopsis:

Benchmark              Mode  Cnt          Score         Error  Units
KotlinLazy.eagerHash  thrpt   10  166312414.794 ± 4644407.477  ops/s
KotlinLazy.lazyHash   thrpt   10  250935666.677 ± 2535249.580  ops/s

KotlinLazy.eagerHash  avgt   10  5.922 ± 0.032  ns/op
KotlinLazy.lazyHash   avgt   10  3.991 ± 0.012  ns/op

#### Detailed:

Result "jmh.KotlinLazy.eagerHash":
  166312414.794 ?(99.9%) 4644407.477 ops/s [Average]
  (min, avg, max) = (159543759.913, 166312414.794, 169538194.601), stdev = 3071987.982
  CI (99.9%): [161668007.318, 170956822.271] (assumes normal distribution)

Result "jmh.KotlinLazy.lazyHash":
  250935666.677 ?(99.9%) 2535249.580 ops/s [Average]
  (min, avg, max) = (248093843.695, 250935666.677, 253547801.570), stdev = 1676910.624
  CI (99.9%): [248400417.097, 253470916.257] (assumes normal distribution)