测试了来自 jsforcats.com 的代码片段 Firefox 中的执行速度似乎很慢为什么？

如何解决测试了来自 jsforcats.com 的代码片段 Firefox 中的执行速度似乎很慢为什么？

Chrome 与 Firefox。当前版本。在关闭附加组件的情况下进行测试。也刷新了 Firefox。

function measureLoopSpeed() {
  var count = 0
  function addOne() { count = count + 1 }

  // Date.Now() returns a big number representing the number of
  // milliseconds that have elapsed since Jan 01 1970
  var Now = Date.Now()

  // Loop until Date.Now() is 1000 milliseconds (1 second) or more into
  // the future from when we started looping. On each loop,call addOne
  while (Date.Now() - Now < 1000) addOne()

  // Finally it has been >= 1000ms,so let's print out our total count
  console.log(count)
}
undefined

//On Firefox console
measureLoopSpeed()
4227461 debugger eval code:14:11
undefined
measureLoopSpeed()
4103189 debugger eval code:14:11
undefined

//On Chrome console
undefined
measureLoopSpeed()
11193127
undefined
measureLoopSpeed()
11153367
undefined
measureLoopSpeed()
11159575

*** 1 秒内完成的总任务甚至比不上 chrome 1 秒内完成的任务。