After obfuscation there is a performance drop for Mirrors

Questions
3

btw this code:

var variable1 = '5' - 3
var variable2 = '5' + 3
var variable3 = '5' + -'2'
var variable4 = ['10', '10', '10', '10', '10'].map(parseInt)
var variable5 = 'foo ' + 1 + 1
console.log(variable1)
console.log(variable2)
console.log(variable3)
console.log(variable4)
console.log(variable5)

turns into this, it’s no wonder it runs slower

var _0x9947 = [
  'map',
  'log',
  'foo\x20',
  'bvmqO',
  '133039ViRMWR',
  'xPfLC',
  'ytpdx',
  '1243717qSZCyh',
  '2|7|4|6|9|',
  '1ErtbCr',
  '1608314VKvthn',
  '1ZRaFKN',
  'XBoAA',
  '423266kQOYHV',
  '3|0|5|8|1',
  '235064xPNdKe',
  '13RUDZfG',
  '157gNPQGm',
  '1639212MvnHZL',
  'rDjOa',
  'iBHph',
  '9926iRHoRl',
  'split',
]
function _0x33e4(_0x1809b5, _0x37ef6e) {
  return (
    (_0x33e4 = function (_0x338a69, _0x39ad79) {
      _0x338a69 = _0x338a69 - (0x1939 + -0xf * 0x1f3 + 0x1 * 0x469)
      var _0x2b223a = _0x9947[_0x338a69]
      return _0x2b223a
    }),
    _0x33e4(_0x1809b5, _0x37ef6e)
  )
}
;(function (_0x431d87, _0x156c7f) {
  var _0x10cf6e = _0x33e4
  while (!![]) {
    try {
      var _0x330ad1 =
        -parseInt(_0x10cf6e(0x6c)) * -parseInt(_0x10cf6e(0x6d)) +
        -parseInt(_0x10cf6e(0x74)) * -parseInt(_0x10cf6e(0x78)) +
        parseInt(_0x10cf6e(0x6a)) +
        -parseInt(_0x10cf6e(0x70)) +
        parseInt(_0x10cf6e(0x6e)) * -parseInt(_0x10cf6e(0x75)) +
        parseInt(_0x10cf6e(0x72)) +
        -parseInt(_0x10cf6e(0x67)) * parseInt(_0x10cf6e(0x73))
      if (_0x330ad1 === _0x156c7f) break
      else _0x431d87['push'](_0x431d87['shift']())
    } catch (_0x9f878) {
      _0x431d87['push'](_0x431d87['shift']())
    }
  }
})(_0x9947, -0xb6270 + 0x4dfd2 * 0x2 + 0x75460 * 0x2),
  (function () {
    var _0x1f346d = _0x33e4,
      _0x860db8 = {
        ytpdx: _0x1f346d(0x6b) + _0x1f346d(0x71),
        bvmqO: function (_0x560787, _0x519b9e) {
          return _0x560787 - _0x519b9e
        },
        rDjOa: function (_0x4501fe, _0x2b07a3) {
          return _0x4501fe + _0x2b07a3
        },
        xPfLC: function (_0x5f3c9b, _0x434936) {
          return _0x5f3c9b + _0x434936
        },
        XBoAA: function (_0x535b8a, _0x42eef4) {
          return _0x535b8a + _0x42eef4
        },
        iBHph: _0x1f346d(0x65),
      },
      _0x346c55 = _0x860db8[_0x1f346d(0x69)][_0x1f346d(0x79)]('|'),
      _0x3bf817 = 0x4bb * 0x1 + 0x801 + -0xcbc
    while (!![]) {
      switch (_0x346c55[_0x3bf817++]) {
        case '0':
          console[_0x1f346d(0x7b)](_0x4c96d8)
          continue
        case '1':
          console[_0x1f346d(0x7b)](_0x101028)
          continue
        case '2':
          var _0x65977d = _0x860db8[_0x1f346d(0x66)]('5', -0x586 + -0x2195 + -0x6 * -0x685)
          continue
        case '3':
          console[_0x1f346d(0x7b)](_0x65977d)
          continue
        case '4':
          var _0x56d39b = _0x860db8[_0x1f346d(0x76)]('5', -'2')
          continue
        case '5':
          console[_0x1f346d(0x7b)](_0x56d39b)
          continue
        case '6':
          var _0x544285 = ['10', '10', '10', '10', '10'][_0x1f346d(0x7a)](parseInt)
          continue
        case '7':
          var _0x4c96d8 = _0x860db8[_0x1f346d(0x68)]('5', 0x622 * -0x6 + 0x4a * 0x3 + 0x1 * 0x23f1)
          continue
        case '8':
          console[_0x1f346d(0x7b)](_0x544285)
          continue
        case '9':
          var _0x101028 = _0x860db8[_0x1f346d(0x6f)](
            _0x860db8[_0x1f346d(0x6f)](_0x860db8[_0x1f346d(0x77)], 0x6fb * 0x5 + 0x1ebf * 0x1 + -0x41a5),
            0x209 * 0xa + 0x1314 + -0x276d
          )
          continue
      }
      break
    }
  })()
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