The steps to routinely (looping) check local to internet performance

LoopingNetworkSpeedTest.ps1

Write-Warning "This code is not meant to be run sequentially, run it in sections following comment instructions"
exit

<##############################################################################
    create transfer file
##############################################################################>

$FilePath = "C:\temp\transfer_file.txt"
$DesiredFileSizeKB = 1024 * 7    # 7 MB

if (Test-Path $FilePath) {
    Remove-Item $FilePath
}

do {
"Better living through programming" |
    Out-File $FilePath -Append
} while ((
    Get-ChildItem $FilePath |
        Select-Object @{Name = "SizeKB"; Expression = { $_.Length / 1024 }} |
        Select-Object -ExpandProperty SizeKB) -lt $DesiredFileSizeKB
)

<##############################################################################
    create transfer file
##############################################################################>

# copy the file to a shared and public internet location (I used my blog
# to host the file for example)

<##############################################################################
    download file
##############################################################################>

# DownloadFile is the location of the public file
#
$DownloadFile = "http://your-file-location/transfer_file.txt"
$DestinationFile = "C:\temp\downloaded_file.txt"
$OutputFile = "C:\temp\network_test.csv"
$Iterations = 10

$WebClient = New-Object System.Net.WebClient

while ($true) {
    $Output = 
        for ($i = 0; $i -lt $Iterations; $i++) {
            $PreDownloadTimeStamp = Get-Date
            $WebClient.DownloadFile($DownloadFile, $DestinationFile)
            $PostDownloadTimeStamp = Get-Date

            $TransferDurationSec = $PostDownloadTimeStamp.Subtract($PreDownloadTimeStamp).TotalSeconds
            if (Test-Path $DestinationFile) {
                $TransferSizeBytes = Get-ChildItem $DestinationFile | Select-Object -ExpandProperty Length
            }
            else {
                $TransferSizeBytes = 0
            }
            $TransferSizeMb = $TransferSizeBytes / 1024 / 1024 * 8
            $TransferThroughput = $TransferSizeMb / $TransferDurationSec

            $i |
                Select-Object @{Name = "CurrentDateTime"; Expression = { Get-Date }},
                    @{Name = "Iteration"; Expression = { $_ }},
                    @{Name = "Throughput"; Expression = { $TransferThroughput }}
        }

    $OutputAggregated = 
        $Output |
            Measure-Object -Average Throughput |
            Select-Object @{Name = "CurrentDateTime"; Expression = { Get-Date }},
                @{Name = "ThroughputMbps"; Expression = { $_.Average }}

    $OutputAggregated
    $OutputAggregated | Export-Csv $OutputFile -NoTypeInformation -Append

    Start-Sleep -Seconds 60
}