updatetypedata vs property attachment.ps1

$func = Invoke-RestMethod https://gist.githubusercontent.com/santisq/bd3d1d47c89f030be1b4e57b92baaddd/raw/73952eceb82cd31b8cb9f2fd04e2a3ef3c428110/Measure-Expression.ps1
. ([scriptblock]::Create($func))

time -TestCount 5 -OutputAllTests @{
    'TestUpdateTypeData'             = {
        class TestUpdateTypeData {
            hidden [int] $_x
            hidden [int] $_y

            TestUpdateTypeData([int] $x, [int] $y) {
                $this._x, $this._y = $x, $y
            }

            static TestUpdateTypeData() {
                $updateTypeDataSplat = @{
                    MemberName  = 'X'
                    MemberType  = 'CodeProperty'
                    Value       = [TestUpdateTypeData].GetMethod('get_X')
                    SecondValue = [TestUpdateTypeData].GetMethod('set_X')
                    TypeName    = 'TestUpdateTypeData'
                }

                Update-TypeData @updateTypeDataSplat
                $updateTypeDataSplat['MemberName'] = 'Y'
                $updateTypeDataSplat['Value'] = [TestUpdateTypeData].GetMethod('get_Y')
                $updateTypeDataSplat.Remove('SecondValue')
                Update-TypeData @updateTypeDataSplat
            }

            hidden static [int] get_X([psobject] $instance) {
                return $instance._x
            }

            hidden static [int] get_Y([psobject] $instance) {
                return $instance._y
            }

            hidden static [void] set_X([psobject] $instance, [int] $value) {
                $instance._x = $value
            }
        }

        $i = 10000
        while ($i--) {
            $instance = [TestUpdateTypeData]::new($i, $i)
            $instance.X; $instance.Y
        }
    }
    'TestPSCodePropertyAttach' = {
        class TestPSCodePropertyAttach {
            hidden [int] $_x
            hidden [int] $_y

            TestPSCodePropertyAttach([int] $x, [int] $y) {
                $this._x, $this._y = $x, $y
                [TestPSCodePropertyAttach]::InitializeAccessors($this)
            }

            hidden static [int] get_X([psobject] $instance) {
                return $instance._x
            }

            hidden static [int] get_Y([psobject] $instance) {
                return $instance._y
            }

            hidden static [void] set_X([psobject] $instance, [int] $value) {
                $instance._x = $value
            }

            hidden static [void] InitializeAccessors([psobject] $instance) {
                # get; set; for X
                $instance.PSObject.Properties.Add(
                    [System.Management.Automation.PSCodeProperty]::new(
                        'X',
                        [TestPSCodePropertyAttach].GetMethod('get_X'),
                        [TestPSCodePropertyAttach].GetMethod('set_X')))

                # get; for Y
                $instance.PSObject.Properties.Add(
                    [System.Management.Automation.PSCodeProperty]::new(
                        'Y',
                        [TestPSCodePropertyAttach].GetMethod('get_Y')))
            }
        }

        $i = 10000
        while ($i--) {
            $instance = [TestPSCodePropertyAttach]::new($i, $i)
            $instance.X; $instance.Y
        }
    }
}