Slow RDP connections

Slow establishment of a RDP connection (>10sec)

Check if the CTL is set:

Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\AutoUpdate" -Name "RootDirUrl"

Set CTL:

New-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\AutoUpdate" -Name "RootDirUrl" -Value http://<Your_CTL_URL>/ctl