https://learn.microsoft.com/en-us/troubleshoot/windows-server/remote/frame-rate-limited-to-30-fps

On RDP Server, Open up Registry Editor as administrator

Go to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations

Add a new DWORD

Set the name to DWMFRAMEINTERVAL

Set the Value to 15, and base Decimal.

Apply and reboot.

You may also want to look at enabling the following options in Group Policy Editor

Computer Configuration > Policies > Administrative Template > Windows Components > Remote Desktop Session Host > Connections > Select RDP transport Protocols > Use both TCP and UDP

Computer Configuration > Policies > Administrative Template > Windows Components > Remote Desktop Session Host > Connections > Remote Session Environment > Use hardware graphics adapters for all Rmote Desktop Services sessions

https://github.com/maxprehl/TurboRemoteFX
https://www.reddit.com/r/sysadmin/comments/fv7d12/pushing_remote_fx_to_its_limits/