I had some poor performance with XRDP, so I found this nugget of info that helped things a little:
Backup xrdp.ini (XRDP config)
sudo cp /etc/xrdp/xrdp.ini /etc/xrdp/xrdp.back
Open the XRDP config with nano:
sudo nano /etc/xrdp/xrdp.ini
Under [Globals] change max_bpp to 128 and add this line below:
use_compression=yes
Restart XRDP services:
systemctl restart xrdp.service