Hello,Thank you for posting in Q&A forum.
To mitigate the CPU usage issue, we can try below steps:
1.In RDP client, click "Show Options" > Experience tab, uncheck "Persistent bitmap caching" to improve the CPU usage.
2.You can configure GPO to use WDDM for RDP:
Navigate to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment.
Check "Use WDDM graphics display driver for Remote Desktop Connections."
3.Update related driver and see if it helps.
To help other customers who may be facing the same issue, please don't forget to vote if the reply is helpful.
Best Regards
Zunhui