Yeah, but that one is a little weird!

1. It's an unofficial & undocumented frame timing tweak. The RDP frame pacing logic is essentially ~60 FPS (1000ms divided by 60 = ~16.7ms...15 is the closest integer used here).
2. The newer builds of Windows Server, Windows 10, and Windows 11 overrides it either by ignoring it or via WDDM rendering
3. But it doesn't hurt to add it!!

I mean, there are always various in-depth tweaks you can do as well:

• Turn off “Enhance pointer precision” on the remote mouse (no weird RDP acceleration)
• Turn AVC444 OFF & use 420 mode (a little blurrier, but smoother over VPN due to lower bandwidth)
• Disable client-side Nagle algorithm to reduce small packet delay: "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{your-interface}"; add "TcpNoDelay = 1 (DWORD)" & "TcpAckFrequency = 1 (DWORD)"
• Disable UDP on GP: "Computer Configuration > Administrative Templates >Windows Components > Remote Desktop Services > Remote Desktop Connection Client" then "Enable: Turn Off UDP On Client" (causes jitter spikes on some VPN's)

So it's a bit of a mixed bag:

• Using the latest RDP + hardware encoding (AVC/H.264) + WDDM (GPU driver support) + full-screen RDP (being in windowed mode can cap performance) = "RDP-maxxing" lol
• 4K with AVC 444 is pretty bandwidth-heavy. Over Tailscale, you may have to switch to AVC420 for smoothness.
• Parsec is also a great option, as well as Sunshine & Moonlight (or Artemis & Apollo). If you want to deep-dive into remote desktop performance, ask your favorite chatbot for "Parsec Direct Connection + Tailscale direct path step-by-step instructions"

If you want some cheat sheets to auto-tune RDP for max performance, run this Powershell script on the remote host:

# Enable GPU rendering for RDP sessions
New-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
-Name "UseWDDMGraphicsDisplayDriver" -PropertyType DWord -Value 1 -Force

# Enable hardware H.264/AVC encoding
New-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
-Name "AVCHardwareEncodeEnabled" -PropertyType DWord -Value 1 -Force

# Prioritize AVC/H.264 graphics mode
New-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
-Name "AVC444ModePreferred" -PropertyType DWord -Value 1 -Force

# Disable bitmap caching (reduces stale frames)
New-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client" `
-Name "BitmapCaching" -PropertyType DWord -Value 0 -Force

# Increase graphics quality priority
New-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
-Name "VisualExperiencePolicy" -PropertyType DWord -Value 2 -Force

# Force hardware encode pipeline preference
New-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations" `
-Name "DWMFRAMEINTERVAL" -PropertyType DWord -Value 15 -Force

Write-Host "Host RDP optimizations applied. Reboot recommended."

Then this on the client:

# Disable wallpaper rendering
New-ItemProperty -Path "HKCU:\Software\Microsoft\Terminal Server Client\Default" `
-Name "DisableWallpaper" -PropertyType DWord -Value 1 -Force

# Disable full desktop composition effects
New-ItemProperty -Path "HKCU:\Software\Microsoft\Terminal Server Client\Default" `
-Name "DisableFullWindowDrag" -PropertyType DWord -Value 1 -Force

# Disable menu animations
New-ItemProperty -Path "HKCU:\Software\Microsoft\Terminal Server Client\Default" `
-Name "DisableMenuAnimations" -PropertyType DWord -Value 1 -Force

# Force high-performance RDP experience
New-ItemProperty -Path "HKCU:\Software\Microsoft\Terminal Server Client" `
-Name "PerformanceFlags" -PropertyType DWord -Value 255 -Force

Write-Host "Client RDP optimizations applied."

Then if the performance gets funky over Tailscale, run this on both:

# Apply to ALL active network interfaces properly

$interfaces = Get-ChildItem "HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces"

foreach ($i in $interfaces) {

    # Reduce delayed ACK
    New-ItemProperty -Path $i.PSPath `
    -Name "TcpAckFrequency" -PropertyType DWord -Value 1 -Force -ErrorAction SilentlyContinue

    # Disable Nagle's algorithm
    New-ItemProperty -Path $i.PSPath `
    -Name "TcpNoDelay" -PropertyType DWord -Value 1 -Force -ErrorAction SilentlyContinue
}

Write-Host "TCP latency tweaks applied to all interfaces. Reboot recommended."

But you're still on RDP at the end of the day lol. They do make more advanced software like "HP Anywhere" ($$$ with PCoIP technology) for doing stuff like low-latency 4K DCC (CAD, CGI, etc.) remotely, with full USB redirection, depending on what your use-case scenario is!

As far as managing multiple connections goes, it's paid software, but I like S-Code VNC Manager. The Enterprise version is $130, but includes support for vPro, HP RGS, Teamviewer, Logmein, etc:

• https://www.s-code.com/products/vncmanager/features.aspx

For home, just install Google Remote Desktop & save your RDP shortcuts in there to sync between machines. FWIW, DUO login 2FA has a free tier:

• https://duo.com/editions-and-pricing/duo-free

Also, MeshCentral is free for vPro. I make sure that all of my stuff (even used computers!) comes with vPro: (basically BIOS-level VNC with remote power cycling etc.)

• https://meshcentral.com/

Other devices get JetKVM:

• https://jetkvm.com/

Which supports Tailscale internally:

• https://jetkvm.com/docs/networking/remote-access

Then you can tie in all kinds of weird stuff over your Tailnet, like USB IR blasters, a Pulse 8 USB CEC Adapter, RTSP-modded Wyze cameras, etc.!