RDP Performance Optimization for Low Latency Remote Access

Remote Desktop Protocol can feel sluggish with default settings, especially for graphically demanding applications. Here's how to optimise RDP for the best user experience.

Direct RDP vs Azure Virtual Desktop

For single-VM scenarios, direct RDP often performs better than AVD:

• Direct RDP: Client → VM (single hop)
• AVD: Client → Gateway → Session Host (multiple hops)

If you don't need AVD's features (pooled desktops, RemoteApp, multi-session), direct RDP is simpler and faster.

Server-Side Optimisations

Enable UDP Transport

RDP over UDP significantly improves performance on lossy networks:

# Enable UDP transport
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
  -Name "SelectTransport" -Value 0 -Type DWord

# 0 = UDP and TCP (default, best)
# 1 = TCP only
# 2 = UDP only

GPU Acceleration

For VMs with GPU (like NV-series), enable RemoteFX:

# Enable hardware graphics adapter
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
  -Name "bEnumerateHWBeforeSW" -Value 1 -Type DWord

# Use hardware default graphics adapter
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
  -Name "AVC444ModePreferred" -Value 1 -Type DWord

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

Frame Rate and Compression

# Maximum frame rate (default 30, max 60)
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations" `
  -Name "DWMFRAMEINTERVAL" -Value 15 -Type DWord
# Value is in milliseconds: 15ms = ~66fps

# Visual quality for moving images
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" `
  -Name "VisualQualityPolicy" -Value 2 -Type DWord
# 0 = Low, 1 = Medium, 2 = High

Client-Side Settings

Windows Remote Desktop Client

Use the modern Remote Desktop app from the Microsoft Store - it supports:

• UDP transport
• H.264/AVC 444 graphics mode
• Better touch/pen input

RDP File Settings

Create an optimised .rdp file:

full address:s:vm.example.com:3389
use multimon:i:1
videoplaybackmode:i:1
enablecredsspsupport:i:1
authentication level:i:2
audiocapturemode:i:1
networkautodetect:i:0
bandwidthautodetect:i:0
connection type:i:6
compression:i:1

Key settings:

• connection type:i:6 - LAN (assumes good connection)
• networkautodetect:i:0 - Disable auto-detect, use specified settings
• videoplaybackmode:i:1 - Optimized video streaming

Network Configuration

Azure NSG Rules

Ensure UDP 3389 is allowed:

resource "azurerm_network_security_rule" "rdp_udp" {
  name                        = "RDP-UDP"
  priority                    = 100
  direction                   = "Inbound"
  access                      = "Allow"
  protocol                    = "Udp"
  source_port_range           = "*"
  destination_port_range      = "3389"
  source_address_prefix       = "YOUR_IP/32"
  destination_address_prefix  = "*"
  resource_group_name         = azurerm_resource_group.this.name
  network_security_group_name = azurerm_network_security_group.vm.name
}

Disable Window Auto-Tuning (if having issues)

Sometimes auto-tuning causes problems:

# Check current setting
netsh interface tcp show global

# Disable if needed
netsh interface tcp set global autotuninglevel=disabled

Monitoring Performance

Check Graphics Mode

# Query graphics mode
qwinsta /vm

# Check RemoteFX status
Get-WmiObject -Namespace "root\cimv2\TerminalServices" -Class Win32_TSGeneralSetting

Measure Latency

# In-session latency check
$stats = Get-WmiObject -Namespace "root\cimv2\TerminalServices" `
  -Class Win32_PerfFormattedData_TermService_TerminalServicesSession

$stats | Select-Object Name,
  @{N='RTT';E={$_.OutputTimeBetweenPDUs}}

Azure-Specific Tips

Proximity Placement Groups

For lowest latency to on-premises:

resource "azurerm_proximity_placement_group" "rdp" {
  name                = "ppg-rdp-vms"
  location            = azurerm_resource_group.this.location
  resource_group_name = azurerm_resource_group.this.name
}

Accelerated Networking

Always enable on supported VM sizes:

resource "azurerm_network_interface" "vm" {
  name                = "nic-rdp-vm"
  location            = azurerm_resource_group.this.location
  resource_group_name = azurerm_resource_group.this.name

  enable_accelerated_networking = true  # Important!

  ip_configuration {
    name                          = "internal"
    subnet_id                     = azurerm_subnet.vms.id
    private_ip_address_allocation = "Dynamic"
  }
}

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