benchmark-command

function Benchmark-Command ([ScriptBlock]$Expression, [int]$Samples = 1, [Switch]$Silent, [Switch]$Long) {
<#
.SYNOPSIS
  Runs the given script block and returns the execution duration.
  Hat tip to StackOverflow. http://stackoverflow.com/questions/3513650/timing-a-commands-execution-in-powershell
  
.EXAMPLE
  Benchmark-Command { ping -n 1 google.com }
#>
    $timings = @()
    do {
        $sw = New-Object Diagnostics.Stopwatch
        if ($Silent)
        {
            $sw.Start()
            $null = & $Expression
            $sw.Stop()
            Write-Host "." -NoNewLine
        }
        else {
            $sw.Start()
            & $Expression
            $sw.Stop()
        }
        $timings += $sw.Elapsed

        $Samples--
    }
    while ($Samples -gt 0)

    Write-Host

    $stats = $timings | Measure-Object -Average -Minimum -Maximum -Property Ticks

    # Print the full timespan if the $Long switch was given.
    if ($Long)
    {  
        Write-Host "Avg: $((New-Object System.TimeSpan $stats.Average).ToString())"
        Write-Host "Min: $((New-Object System.TimeSpan $stats.Minimum).ToString())"
        Write-Host "Max: $((New-Object System.TimeSpan $stats.Maximum).ToString())"
    }
    else
    {
        # Otherwise just print the milliseconds which is easier to read.
        Write-Host "Avg: $((New-Object System.TimeSpan $stats.Average).TotalMilliseconds)ms"
        Write-Host "Min: $((New-Object System.TimeSpan $stats.Minimum).TotalMilliseconds)ms"
        Write-Host "Max: $((New-Object System.TimeSpan $stats.Maximum).TotalMilliseconds)ms"
    }
}