Windows 10 VPN/DNS problem repro

VPN-DNS-Test.ps1

# Must be run as admin for registry changes
# This illustrates the problem with the Stack Exchange VPN, results locally:
# Total time for default behavior (seconds): 12.0566448
# Total time with registry tweaks (seconds): 1.0808937

# Broken/Slow (default Windows 10 behavior)
Set-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\DNSClient" -Name DisableSmartNameResolution -Value 0 -Type DWord
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters" -Name DisableParallelAandAAAA -Value 0 -Type DWord
ipconfig /flushdns | Out-null
Write-Host "Total time for default behavior (seconds): " -NoNewLine
(Measure-Command { ping -n 1 ny-sql01.ds.stackexchange.com }).TotalSeconds

# Fixed/Fast
Set-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows NT\DNSClient" -Name DisableSmartNameResolution -Value 1 -Type DWord
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters" -Name DisableParallelAandAAAA -Value 1 -Type DWord
ipconfig /flushdns | Out-null
Write-Host "Total time with registry tweaks (seconds): " -NoNewLine
(Measure-Command { ping -n 1 ny-sql01.ds.stackexchange.com }).TotalSeconds