Hello @PCProfi SA
Try to change security layer to "RDP Security Layer" , and the encryption level to High instead of negotiate
open Local Group Policy Editor, expand Computer Policy > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host, and then click on Security.
Reference thread:
RDP File transfer is really slow. Any way to speed it up?
File transfer via RDP is slow
Best Regards
Karlie
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