Range benchmark sluggish after migrating to Scala3

Question

Being aware that Range is slow compared to a loop under Scala2, I migrated the benchmark to Scala3, and observed a horrible downgrade in performance in case of Range class.

Note that while loop time is comparable .

My questions:

• Is my benchmark correct?
• Did Range implementation change under Scala3 and performance hit is to be expected?

Scala2:
while loop time: 0.015882699999999996 ms
range loop time: 0.20659249999999996 ms

Scala3:
while loop time: 0.011921900000000001 ms
range loop time: 464.97765689999994 ms

Benchmark code:

package scalashop

import org.scalameter.{Key, Warmer, config}


object TestDoubleLoopPerformance {
  val standardConfig = config(
    Key.exec.minWarmupRuns := 5,
    Key.exec.maxWarmupRuns := 10,
    Key.exec.benchRuns := 10,
    // Key.verbose := true
  ) withWarmer(Warmer.Default())


  def main(args: Array[String]): Unit = {
    val whileLoopTime = standardConfig measure {
      for (iter <- 0 to 100) {
        sumWithWhileLoop(1000, 2000)
      }
    }
    println(s"while loop time: $whileLoopTime")

    val rangeLoopTime = standardConfig measure {
      for (iter <- 0 to 100) {
        sumWithRange(1000, 2000)
      }
    }
    println(s"range loop time: $rangeLoopTime")
  }

  private def sumWithRange(xEnd: Int, yEnd: Int) = {
    var sum = 0
    for {
      x <- 0 until xEnd
      y <- 0 until yEnd
    } sum += 1
    sum
  }

  private def sumWithWhileLoop(xEnd: Int, yEnd: Int) = {
    var sum = 0
    var x = 0
    while (x < xEnd) {
      var y = 0
      while (y < yEnd) {
        sum += 1
        y += 1
      }
      x += 1
    }
    sum
  }
}

Environment:

• JVM: openjdk 11.0.9.1
• Scalameter: 0.21