processorcounters.ps1

(Get-Counter '\Processor(*)\% Processor Time').CounterSamples | Select-Object @(
    @{
        Name = 'Path'
        Expression = { $_.Path.TrimStart('\').ToUpper() }
    }
    'InstanceName'
    @{
        Name = 'Load'
        Expression = { ($_.CookedValue / 100).ToString('P') }
    }
)

function CalcUsage {
    param([int64[]]$Usage)

    ([System.Linq.Enumerable]::Sum($Usage) / 100 / $env:NUMBER_OF_PROCESSORS).ToString('P')
}

(Get-Counter '\Process(*)\% Processor Time' -EA 0 -).Countersamples |
    Sort-Object CookedValue -Descending |
    Group-Object InstanceName |
    ForEach-Object {
        if($_.Name -eq '_total') { return }
        [pscustomobject]@{
            ProcessInstances = $_.Count
            ProcessName      = $_.Name
            Usage            = CalcUsage $_.Group.CookedValue
        }
    }