来自 https://qa.1r1g.com/sf/ask/4326169431/
$MaxClockSpeed = (Get-CimInstance CIM_Processor).MaxClockSpeed
$ProcessorPerformance = (Get-Counter -Counter "\Processor Information(_Total)\% Processor Performance").CounterSamples.CookedValue
$CurrentClockSpeed = $MaxClockSpeed*($ProcessorPerformance/100)
Write-Host "Current Processor Speed: " -ForegroundColor Yellow -NoNewLine
Write-Host $CurrentClockSpeed