I'm having some issues running RDS with some published RemoteApps on a 2019 Server.
Some clients report the Remoteapps performing extremely slowly, even with high speed connections and the servers on the farm running without any unusual RAM and CPU usage.
After reading some reports of other people with the same problem before the Windows 10 1803 update, I've tested and confirmed that with some mouses which has a higher DPI/polling rate, the Remoteapps perform extremely slow in any client running Windows 10 1803 or newer. I did the test myself on my workstation running Windows 10 2004, switching between two Microsoft mouses: a Classic Intellimouse (1000hz/polls per second) and a Wireless 4000 (125hz/polls per second). I didn't even close the app when switching the mouses. It looks like mouses like the Classic Intellimouse, or others like better Logitech and Razor models, for example, somehow overload the Remoteapp connection.
I have many clients with the same issue, in many places and different hardware configurations, but seems like the common point is running Windows 10 1803 or newer and having a high DPI mouse. On an old Technet thread people solved by replacing their mouses by cheaper ones or in some cases, replacing mstsc.exe and mstscax.dll by copies from a Windows 10 1709 machine. Both solutions are quite hard for the users in my case. What else can be done? Is there any fix for this?
The old technet thread which guided me to test the mouses is: https://social.technet.microsoft.com/Forums/en-US/f3e9852b-393c-4aa0-9d2f-961a82cfc603/remoteapp-after-windows-10-update-1803-are-slow-and-right-mouse-button-is-not-responding-it-reacts?forum=winserverTS