Long connection time with kiosk mode

Hello! Iam using Thinstation and included xfwm4 for my usb mount into my config. When Iam adding XFWM4_KIOSK=true to hide the menu its taking a long time til my rdp session gets built up. That only occurs when Iam using the kiosk mode. Is there any solution to reduce the connection time?

Thanks in advance :)